Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
hanh van » thanh van, khanh van, hanh san
doi nang » dai nang, hoi nang, voi nang
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
sach doi » sach hoi, sach moi, sach dao
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
truc va » thuc va, thuc vat, trung va
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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 doi nang xa hoi. hieu van cham truc va ((((hanh van) or (hanh tai))) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi nang xa hoi. hieu van cham truc va ((((hanh van) OR (hanh tai))) OR (hanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach doi nang xa hoi. hieu van cham truc va ((((hanh van) or (hanh tai))) or (hanh va)) cua tre*.