Perhaps you should try some spelling variations:
ban tinh » ban thanh, quan tinh, ban hanh
su sach » so sach, vu sach
cau tre » cau tren, cau treo, cuu tre
tinh va » tich va, trinh van, trinh vat
cam cua » ca cua, nam cua, cau cua
hieu ve » hieu va, hieu van
cau tra » ca tra, cau ra, cau truc
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
ve cam » ve cham, ve cac, va cam

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

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