Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van tham » van thanh, van tuan, van chat
hanh tai » thanh tai, hang tai, han tai
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
lang va » lang van, hang va, lang ha
va tham » va cham, va thanh, va thuat
sach ky » sac ky, sach y, sach ty
dai hai » dai han, dai tai, dai thao
dai hoi » dai hoc, dai moi
cua tre » cua te, cuu tre, cua triet

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 ((dai hoi) or (dai hai)). lieu ((va tham) OR (van tham)) lang va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((dai hoi) OR (dai hai)). lieu ((va tham) OR (van tham)) lang va hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((dai hoi) or (dai hai)). lieu ((va tham) OR (van tham)) lang va hanh tai cua tre*".