Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
qua cham » qua hai, qua cac, va cham
nang tai » tang tai, sang tai, nang cao
hanh tai » thanh tai, han tai, hinh tai
hang tai » hang va, dung tai
tai cuu » tai cuc, tai buu, tai cua
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
lao va » tao va, cao va, bao va
lo va » lo van, ly va, le 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 ky ((nang tai) OR (hang tai)) hoi. hieu qua cham ((lo va) or (lao va)) hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang tai) OR (hang tai)) hoi. hieu qua cham ((lo va) OR (lao va)) hanh tai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang tai) OR (hang tai)) hoi. hieu qua cham ((lo va) or (lao va)) hanh tai cuu tre*".