Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
qua cham » qua hai, qua cac, va cham
hanh tai » thanh tai, hang tai, han tai
nang tai » hang tai, tang tai, sang tai
tai cua » thai cua, tai cuc, tri cua
tai hoi » tai khoi, dai hoi, tai hai
cua tre » cua te, cuu tre, cua triet
lao va » tao va, cao va, bao va
y nang » ky nang, ly nang, v nang
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) or (thuat sach)) y nang tai hoi. hieu qua cham ((lo va) OR (lao va)) hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) y nang tai hoi. hieu qua cham ((lo va) OR (lao va)) hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) y nang tai hoi. hieu qua cham ((lo va) OR (lao va)) hanh tai cua tre*".