Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van vanh » van anh, van hanh, van manh
vanh dai » van dai, vanh tai, lanh dao
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 thuoc, luat tuc
lam vo » lam co, lam so, lam vu
cua tu » cua su, cua cu, cua te

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 vanh dai ((cua tuc) OR (cua tu))~.
• 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 vanh dai ((cua tuc) OR (cua tu)).
• 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 vanh dai ((cua tuc) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vay khach)) ky lang xa hoi. hieu van lam vo van vanh dai ((cua tuc) OR (cua tu))*.