Should I use 向前 or 向后？
(It's my honor that somebody can use my answer.
It's also my bad that I didn't use good words.)

The following expressions may help.

look up forward
往尾查
往後頁查
查後面的頁數
向字典後面查
向多的頁數查
繼續向下查

look up backward
往頭查
往前頁查
查前面的頁數
向字典前面查
向少的頁數查
回頭往前查