Perhaps you should try some spelling variations:
vu sach » vu bach, vu khach
cac bac » cac bai, cac ban, cac cach
su sach » so sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (su sach)) ky tang xa hoi. hieu ve ((cac tuc) or (cac bac)) va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky tang xa hoi. hieu ve ((cac tuc) OR (cac bac)) va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky tang xa hoi. hieu ve ((cac tuc) or (cac bac)) va hanh vi cua te*.