Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
duc gia » quoc gia
lam duc » lam duoc, pham duc, nam duoc
van lam » van nam
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ((ky lang) OR (ky tang)) xa hoi. hieu van lam duc gia thanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky lang) OR (ky tang)) xa hoi. hieu van lam duc gia thanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky lang) OR (ky tang)) xa hoi. hieu van lam duc gia thanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky lang) OR (ky tang)) xa hoi. hieu van lam duc gia thanh vi ((cua tre) or (cuu tre))*.