Perhaps you should try some spelling variations:
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van ban
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
van anh » van thanh, tuan anh, van minh
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
dai ky » dan ky, dai ly, sai ky
su dai » sau dai, si dai, su tai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su dai ky lang xa hoi. ((hieu va) OR (hieu qua)) cam duc ((van hanh) or (van anh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dai ky lang xa hoi. ((hieu va) OR (hieu qua)) cam duc ((van hanh) OR (van anh)) thai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su dai ky lang xa hoi. ((hieu va) OR (hieu qua)) cam duc ((van hanh) or (van anh)) thai cua tre*".