Perhaps you should try some spelling variations:
hieu tao » hieu thao, chieu cao, chieu tro
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
mang xa » lang xa, mang may, dang xay
tao cau » tao cu, tao cao, tao sau
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
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: tu sach ky ((((nang xa) or (mang xa))) or (nang cao)) hoi. hieu tao cau truc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((((nang xa) OR (mang xa))) OR (nang cao)) hoi. hieu tao cau truc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((nang xa) or (mang xa))) or (nang cao)) hoi. hieu tao cau truc va hanh dai cua tre*.