Perhaps you should try some spelling variations:
ban thanh » ban hang
kho tang » cao tang
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, ky trong
cam duc » cam xuc, cao duc, pham duc
su cac » tu cac, su cao, su can
ma hoi » mai hoi, xa hoi, ma hoa
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 cac ((ky tang) or (kho tang)) ma hoi. hieu ve cam duc ((ban thanh) OR (ban hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ((ky tang) OR (kho tang)) ma hoi. hieu ve cam duc ((ban thanh) OR (ban hanh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ((ky tang) or (kho tang)) ma hoi. hieu ve cam duc ((ban thanh) OR (ban hanh)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su cac ((ky tang) or (kho tang)) ma hoi. hieu ve cam duc ((ban thanh) OR (ban hanh)) tai cua tre*.