Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh di » thanh doi, thanh de, thanh do
cau tren » cu tren, dau tren, ca tren
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
luc ban » duc ban, cuc ban, luc bat
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cua triet, dua tren
cuu tre » cau treo
sac ky » cac ky, sai ky
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 nang xa hoi. hieu van cac luc ban thanh di ((cua tre) or (((cuu tre) OR (cau tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu van cac luc ban thanh di ((cua tre) OR (((cuu tre) OR (cau tren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu van cac luc ban thanh di ((cua tre) or (((cuu tre) OR (cau tren))))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu van cac luc ban thanh di ((cua tre) or (((cuu tre) OR (cau tren))))*.