Perhaps you should try some spelling variations:
ban thanh » ban hang
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
ban hanh » ban hang
cua tre » cua te, cua triet, dua tren
su sach » so sach, vu sach
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
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 tru nang xa hoi. hieu ve cam duc ((ban thanh) OR (ban hanh)) lai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tru nang xa hoi. hieu ve cam duc ((ban thanh) OR (ban hanh)) lai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tru nang xa hoi. hieu ve cam duc ((ban thanh) OR (ban hanh)) lai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach tru nang xa hoi. hieu ve cam duc ((ban thanh) OR (ban hanh)) lai ((cua tre) or (cuu tre))*.