Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cac toc » cac toi, cac nuoc, cac thoi
vu sach » vu bach, su sach, vu khach
cac tuc » cac tu, cac tac, cac nuoc
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky tang xa hoi. hieu van ((cac tuc) or (cac toc)) va tinh vi ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky tang xa hoi. hieu van ((cac tuc) OR (cac toc)) va tinh vi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky tang xa hoi. hieu van ((cac tuc) or (cac toc)) va tinh vi ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky tang xa hoi. hieu van ((cac tuc) or (cac toc)) va tinh vi ((cuu tre) OR (cau treo))*.