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

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 x hoi. ((hieu ve) or (hieu qua)) cam duc ban ((hang doi) OR (hang di)) cau tren~.
• 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) OR (hang di)) cau 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) OR (hang di)) cau 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) OR (hang di)) cau tren*.