Perhaps you should try some spelling variations:
vu sach » vu bach, vu khach
va hanh » van hanh, va thanh, va danh
cac ban » cac dan, cac van, can ban
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach
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 lang xa hoi. hieu ve ((cac tuc) or (cac ban)) va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky lang xa hoi. hieu ve ((cac tuc) OR (cac ban)) va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky lang xa hoi. hieu ve ((cac tuc) or (cac ban)) va hanh vi cua te*.