Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hang tai » hang va, dung tai
tai cua » thai cua, tai cuc, tri cua
hieu va » lieu va, hieu qua
va cham » va chat, va tham
dai hoi » dai hoc, dai hai, dai moi
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
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 ((y nang) OR (ky nang)) dai hoi. hieu va cham ((lo va) or (lao va)) hang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (ky nang)) dai hoi. hieu va cham ((lo va) OR (lao va)) hang tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) OR (ky nang)) dai hoi. hieu va cham ((lo va) or (lao va)) hang tai cua tre*".