Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
danh vai » danh sai, doanh van, dang van
sach ky » sac ky, sach y, sach ty
danh va » doanh va, hanh va, anh va
te sach » toc sach
cac toc » cac toi, cac thoi
hieu ve » hieu va, hieu van
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: te sach ky nang xa hoi. hieu ve ((cac toc) OR (cac nuoc)) xa ((danh vai) or (danh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu ve ((cac toc) OR (cac nuoc)) xa ((danh vai) OR (danh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu ve ((cac toc) OR (cac nuoc)) xa ((danh vai) or (danh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu ve ((cac toc) OR (cac nuoc)) xa ((danh vai) or (danh va)) cua tre*.