Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van lam » van nam
cua tuc » cua duc, cua tu, luat tuc
lam vo » lam co, lam so, lam vu

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