Perhaps you should try some spelling variations:
cau treo » cau theo, cau triet, cau trieu
danh vai » danh sai, danh va, doanh van
cau tren » cu tren, dau tren, ca tren
cac thoi » cac toi, cac hop, cac tro
hieu ve » hieu va, hieu van
cac toc » cac toi, cac nuoc
sach ky » sac ky, sach y, sach ty
ta danh » tac danh, tao danh, tap danh
nang xa » nang x, lang xa, nang ma
te sach » toc sach

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 thoi)) ta danh vai ((cau tren) or (cau treo))~.
• 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 thoi)) ta danh vai ((cau tren) OR (cau treo)).
• 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 thoi)) ta danh vai ((cau tren) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu ve ((cac toc) OR (cac thoi)) ta danh vai ((cau tren) or (cau treo))*.