Perhaps you should try some spelling variations:
cau tren » dau tren, ca tren, cau treo
hang doi » hang di, hang loi, huong doi
ban hang » ngan hang
te sach » toc sach
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cu tren » tu tren, dua tren
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((hieu ve) OR (hieu qua)) cam duc ban hang doi ((cau tren) OR (cu tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. ((hieu ve) or (hieu qua)) cam duc ban hang doi ((cau tren) OR (cu tren))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((hieu ve) or (hieu qua)) cam duc ban hang doi ((cau tren) OR (cu tren))*.