Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
doanh va » doan va, doanh tai, doanh cua
tu cach » tu cac
cach tu » cach thuc
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
anh va » hanh va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach tu nang xa hoi. ((hieu van) OR (hieu va)) giao duc va ((anh va) or (doanh va)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu nang xa hoi. ((hieu van) OR (hieu va)) giao duc va ((anh va) OR (doanh va)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach tu nang xa hoi. ((hieu van) OR (hieu va)) giao duc va ((anh va) or (doanh va)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu cach tu nang xa hoi. ((hieu van) OR (hieu va)) giao duc va ((anh va) or (doanh va)) cua te*.