Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
te sach » toc sach
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
da thuc » dan thuc, dai thuc, dam thuc
vien da » vien dai, hien dai
nang xa » lang xa, nang ma, mang xa
sach ky » sac ky, sach y, sach ty
lua tre » cua tre, luy tre, dua tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang xa) or (nang x)) hoi. hieu vien da thuc vat ((danh vi) OR (danh di)) lua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (nang x)) hoi. hieu vien da thuc vat ((danh vi) OR (danh di)) lua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) or (nang x)) hoi. hieu vien da thuc vat ((danh vi) OR (danh di)) lua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) or (nang x)) hoi. hieu vien da thuc vat ((danh vi) OR (danh di)) lua tre*.