Perhaps you should try some spelling variations:
danh kien » dinh kien, danh viet, van kien
tham thuc » nham thuc, pham thuc, tam thuc
linh kien » sinh vien, tinh dien, kinh dien
doc sach » hoc sach, toc sach, nuoc sach
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, thuc day
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: doc sach ky nang xa hoi. lieu va tham thuc va ((danh kien) or (linh kien)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. lieu va tham thuc va ((danh kien) OR (linh kien)) cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. lieu va tham thuc va ((danh kien) or (linh kien)) cua tre*.