Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
luoc can » luc canh, hoc can, luoc dai
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
cua chu » sua chua
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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 ty nang cao hoc. hieu ve cac ((luc va) or (luoc can)) hanh vi cua chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang cao hoc. hieu ve cac ((luc va) OR (luoc can)) hanh vi cua chu*.