Perhaps you should try some spelling variations:
danh khien » danh kien, doanh chien, dinh kien
thuc dayt » thuc vat, thuc dan, thuc xay
khien cua » khien qua, khien tu, trien cua
doc sach » hoc sach, toc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
thuc day » thuc dan, thuc vat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
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. hieu van tham ((thuc day) or (thuc dayt)) danh khien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. hieu van tham ((thuc day) OR (thuc dayt)) danh khien cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. hieu van tham ((thuc day) or (thuc dayt)) danh khien cua tre*.