Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
dau dai » dat dai, sau dai, dau da
dan dau » danh dau, doan dau, van dau
va cham » va chat, va tham
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao

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 xa) OR (nang x)) hoi. hieu ((va cham) or (va cao)) thuc dan dau dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (nang x)) hoi. hieu ((va cham) OR (va cao)) thuc dan dau dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) OR (nang x)) hoi. hieu ((va cham) or (va cao)) thuc dan dau dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) OR (nang x)) hoi. hieu ((va cham) or (va cao)) thuc dan dau dai cua tre*.