Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban tinh » ban thanh, quan tinh, ban hanh
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
luc ban » duc ban, cuc ban, luc bat
tinh va » tich va, trinh van, trinh vat
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, cua thep

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 ky nang xa hoi. hieu van cam luc ban tinh va ((cuu tre) or (((cua tre) OR (dua tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van cam luc ban tinh va ((cuu tre) OR (((cua tre) OR (dua tren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu van cam luc ban tinh va ((cuu tre) or (((cua tre) OR (dua tren))))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van cam luc ban tinh va ((cuu tre) or (((cua tre) OR (dua tren))))*.