Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tuc » cua duc, cua tu, cua thuoc
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang cao hoi. hieu ve cac tuc va danh vi cua tuc~.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang cao hoi. hieu ve cac tuc va danh vi cua tuc*.