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