Perhaps you should try some spelling variations:
thuc dan » hoc dan, thuc vat
danh dai » danh dau, danh di, vanh dai
danh sai » dung sai, danh bat, danh dau
te sach » toc 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
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: te sach ky nang xa hoi. lieu va tham ((thuc dan) or (thuc hanh)) ((danh dai) OR (danh sai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. lieu va tham ((thuc dan) OR (thuc hanh)) ((danh dai) OR (danh sai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. lieu va tham ((thuc dan) or (thuc hanh)) ((danh dai) OR (danh sai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. lieu va tham ((thuc dan) or (thuc hanh)) ((danh dai) OR (danh sai)) cua tre*.