Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
vai cua » dai cua, hai cua, lai cua
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
sach vu » sach va, sach uu, sach xu
cau luc » cau truc, cau phuc
va cau » van cau, va cac, va dau
cua su » qua su
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach vu) OR (sach tu)) nang x hoi. hieu va cau luc ((van hanh) or (ban hanh)) vai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach vu) OR (sach tu)) nang x hoi. hieu va cau luc ((van hanh) OR (ban hanh)) vai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach vu) OR (sach tu)) nang x hoi. hieu va cau luc ((van hanh) or (ban hanh)) vai cua su".
• Adding a wildcard symbol may retrieve word variants: te ((sach vu) OR (sach tu)) nang x hoi. hieu va cau luc ((van hanh) or (ban hanh)) vai cua su*.