Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hang dau » hang tai
hanh va » hanh vi
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
su tien » su kien, su hien, tu tieng
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va
tuc va » thuc va, truc va, tuc xa

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 ly ((hang dau) or (hang va)) hoi. ((hieu ve) or (hieu van)) cam tuc va hanh va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly ((hang dau) OR (hang va)) hoi. ((hieu ve) OR (hieu van)) cam tuc va hanh va su tien.
• Adding a wildcard symbol may retrieve word variants: toc sach ly ((hang dau) or (hang va)) hoi. ((hieu ve) or (hieu van)) cam tuc va hanh va su tien*.