Perhaps you should try some spelling variations:
hieu cao » chieu cao, hieu cac, hieu ca
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
cao cau » cao cap, co cau, tao cau
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
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) or (sach y)) nang xa hoi. hieu cao cau truc ((va danh) OR (va dinh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) nang xa hoi. hieu cao cau truc ((va danh) OR (va dinh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach y)) nang xa hoi. hieu cao cau truc ((va danh) OR (va dinh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) nang xa hoi. hieu cao cau truc ((va danh) OR (va dinh)) dai cua tre*.