Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vu khach » vu khanh, vu khac, vay khach
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
van lam » van nam
cua tuc » cua tu, cua thuoc, luat tuc
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua duc » 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 lam lo van hanh dai ((cua tuc) OR (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 lam lo van hanh dai ((cua tuc) OR (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 lam lo van hanh dai ((cua tuc) OR (cua duc))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky lang xa hoi. hieu van lam lo van hanh dai ((cua tuc) OR (cua duc))*.