Perhaps you should try some spelling variations:
thien van » thi van
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, lieu va, hieu ve
cam luc » cam xuc, cau luc
cuu tre » cua tre, cau treo
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu nang xa hoi. ((hieu van) or (thien van)) cam luc van hanh vi ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang xa hoi. ((hieu van) OR (thien van)) cam luc van hanh vi ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang xa hoi. ((hieu van) or (thien van)) cam luc van hanh vi ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang xa hoi. ((hieu van) or (thien van)) cam luc van hanh vi ((cuu tre) OR (cau tren))*.