Perhaps you should try some spelling variations:
danh kien » dinh kien, danh viet, linh kien
va thanh » gia thanh, ban thanh, va tinh
kien cua » khien cua, dien cua, tien cua
thuc dan » thuc hanh, hoc dan, thuc vat
doc sach » hoc sach, toc sach, nuoc sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc day
va tham » van tham, va cham, va thuat
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 ((va tham) or (va thanh)) ((thuc va) OR (thuc dan)) danh kien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. hieu ((va tham) OR (va thanh)) ((thuc va) OR (thuc dan)) danh kien cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang xa hoi. hieu ((va tham) or (va thanh)) ((thuc va) OR (thuc dan)) danh kien cua tre".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. hieu ((va tham) or (va thanh)) ((thuc va) OR (thuc dan)) danh kien cua tre*.