Perhaps you should try some spelling variations:
cau trieu » cac trieu, cau triet, chua trieu
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cac tuc » cac toc, cac tu, cac tac
va vanh » va van, va danh, va anh
va hanh » van hanh, va thanh, va danh
tai cau » tai cac, tai cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. ((hieu va) or (lieu va)) cac tuc ((va vanh) OR (va hanh)) tai cau trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. ((hieu va) OR (lieu va)) cac tuc ((va vanh) OR (va hanh)) tai cau trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. ((hieu va) or (lieu va)) cac tuc ((va vanh) OR (va hanh)) tai cau trieu".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu va) or (lieu va)) cac tuc ((va vanh) OR (va hanh)) tai cau trieu*.