Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thai cua » than cua, tai cuc, tri cua
van hanh » ban hanh, van anh, van ban
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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 lang xa hoi. ((hieu ve) OR (hieu van)) cam duc ((van hanh) or (van thanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang xa hoi. ((hieu ve) OR (hieu van)) cam duc ((van hanh) OR (van thanh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky lang xa hoi. ((hieu ve) OR (hieu van)) cam duc ((van hanh) or (van thanh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky lang xa hoi. ((hieu ve) OR (hieu van)) cam duc ((van hanh) or (van thanh)) thai cua tre*.