Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh dai » hanh tai, hanh dao, vanh dai
vu khach » vu khanh, vu khac, vay khach
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cua duc » cua tuc, cua nuoc, cua quoc
lam lo » nam lo, lam co, cam lo
lo van » le van, vo van, so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu khach)) ky lang xa hoi. ((hieu van) OR (hieu va)) lam lo van hanh dai cua duc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) ky lang xa hoi. ((hieu van) OR (hieu va)) lam lo van hanh dai cua duc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu khach)) ky lang xa hoi. ((hieu van) OR (hieu va)) lam lo van hanh dai cua duc".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky lang xa hoi. ((hieu van) OR (hieu va)) lam lo van hanh dai cua duc*.