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