Perhaps you should try some spelling variations:
danh kien » dinh kien, danh viet, linh kien
thuc day » thuc dan, thuc vat
kien cuu » khien cua, khien cau, dien cuc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va tham » van tham, va cham, va thanh
thuc va » thuc vat, thuc dan
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((sach ky) or (cac ky)) nang xa hoi. lieu va tham ((thuc va) or (thuc day)) danh kien cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ky) OR (cac ky)) nang xa hoi. lieu va tham ((thuc va) OR (thuc day)) danh kien cuu tre.
• Adding a wildcard symbol may retrieve word variants: doc ((sach ky) or (cac ky)) nang xa hoi. lieu va tham ((thuc va) or (thuc day)) danh kien cuu tre*.