Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh va » hanh va, thanh ha, thanh ve
dang xay » dang van, van xay
xay nang » may nang, day nang, xuan nang
tu dang » thu dang, tu dong, su dang
hoc gia » hoc giao, hoc giai, toc gia
cac hoc » cach hoc, cac hop, bac hoc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac
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 dang xay nang xa hoi. hieu ve cac hoc gia ((thanh va) OR (thanh van)) ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dang xay nang xa hoi. hieu ve cac hoc gia ((thanh va) OR (thanh van)) ((cua te) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dang xay nang xa hoi. hieu ve cac hoc gia ((thanh va) OR (thanh van)) ((cua te) or (cuu tre))*".