Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sach loai » sach bai, cac loai, sach doi
loai nang » loai nam, luan nang, loai san
hanh tai » thanh tai, hang tai, han tai
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
ve cau » ve cac, le cau, ve cai
ke cau » ket cau
va cau » van cau, va cac, va dau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach loai nang x ho. hieu ((((ve cau) OR (ke cau))) OR (va cau)) duc va hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach loai nang x ho. hieu ((((ve cau) OR (ke cau))) or (va cau)) duc va hanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thuat sach loai nang x ho. hieu ((((ve cau) OR (ke cau))) or (va cau)) duc va hanh tai cua tre*.