Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang cho » nang chon, ngang cho, nang cao
sach ky » sac ky, sach y, sach ty
cho hoc » co hoc, khoa hoc
vuc van » duc van, luc van, thuc van
ve cac » vien cac
anh vi » hanh vi, anh va, anh vu
anh ve » hanh ve, anh va, anh viet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang cho hoc. hieu ((ve cac) or (va cac)) vuc van ((anh vi) OR (anh ve)) cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang cho hoc. hieu ((ve cac) OR (va cac)) vuc van ((anh vi) OR (anh ve)) cua cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang cho hoc. hieu ((ve cac) or (va cac)) vuc van ((anh vi) OR (anh ve)) cua cac*".