Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cua tre » cuu tre, cua triet, dua tren
sach ty » sach y, sach tu, sach thu
truc va » thuc va, thuc vat, trung va
cua te » cua tu
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang xa hoi. hieu van cam ((luc va) or (truc va)) hanh vai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu van cam ((luc va) OR (truc va)) hanh vai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu van cam ((luc va) or (truc va)) hanh vai ((cua tre) or (cua te))*.