Perhaps you should try some spelling variations:
ha trung » he trung, ba trung, va trung
sach thu » sach thue, sach thieu, sach tham
hieu cac » hieu luc, hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
cac ha » cac nha, cac ham, cac hat

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 ty) or (sach thu)) nang xa hoi. hieu cac ha trung ((va danh) or (va hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sach thu)) nang xa hoi. hieu cac ha trung ((va danh) OR (va hanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) or (sach thu)) nang xa hoi. hieu cac ha trung ((va danh) or (va hanh)) dai cua tre*.