Perhaps you should try some spelling variations:
chat trung » chat trong, ha trung, cua trung
hieu cao » chieu cao, hieu cac, hieu ca
sach thu » sach thue, sach thieu, sach tham
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, xach tay
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
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 ty) OR (sach thu)) nang xa hoi. hieu cao chat 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 cao chat trung ((va danh) OR (va hanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) OR (sach thu)) nang xa hoi. hieu cao chat 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 cao chat trung ((va danh) or (va hanh)) dai cua tre*.