Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
van hoe » van hoc, van hieu, van hien
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
dua ban » cua ban, qua ban, mua ban
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
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 sac ky tang ((van hoe) OR (van hoa)). hieu ve cam ((dua ban) or (dia ban)) thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang ((van hoe) OR (van hoa)). hieu ve cam ((dua ban) OR (dia ban)) thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang ((van hoe) OR (van hoa)). hieu ve cam ((dua ban) or (dia ban)) thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang ((van hoe) OR (van hoa)). hieu ve cam ((dua ban) or (dia ban)) thanh hai cua tre*.