Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
duc van » duc va, duc tan, duc manh
cua tre » cuu tre, cua triet, dua tren
banh vi » hanh vi, ban vi, benh vi
duc ban » duc tan, dua ban, duc man
sach ty » sach y, sach tu, sach thu
van lam » van nam
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van lam ((duc ban) OR (duc van)) banh vi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu van lam ((duc ban) OR (duc van)) banh vi ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van lam ((duc ban) OR (duc van)) banh vi ((cua tre) or (cua te))*.