Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, hinh tai
han tai » hang tai, nhan tai, van tai
cham lo » cham o, cam lo, cham soc
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ma hoi. ((hieu ve) or (hieu qua)) cham lo va ((hanh tai) or (han tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ma hoi. ((hieu ve) OR (hieu qua)) cham lo va ((hanh tai) OR (han tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ma hoi. ((hieu ve) or (hieu qua)) cham lo va ((hanh tai) or (han tai)) cua tre*.