Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
hanh lai » hanh tai, thanh lap, thanh loi
van pham » san pham, van phan, van phat
pham xay » phan xay, pham van, pham tai
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
xay va » day va, may va, hay va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ty nang ma hoi. hieu van pham xay va ((hanh lai) or (hanh lam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty nang ma hoi. hieu van pham xay va ((hanh lai) OR (hanh lam)) cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nang ma hoi. hieu van pham xay va ((hanh lai) or (hanh lam)) cua tre*.