Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
hieu van » hieu va, thien van, lieu va
hanh hai » thanh hai, hang hai, hanh tai
ky dang » ky nang, ky danh
cam tuc » cam xuc, cam tu, nam thuc
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky dang xa hoi. ((hieu ve) or (hieu van)) cam tuc va ((hanh hai) OR (nhanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky dang xa hoi. ((hieu ve) OR (hieu van)) cam tuc va ((hanh hai) OR (nhanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky dang xa hoi. ((hieu ve) or (hieu van)) cam tuc va ((hanh hai) OR (nhanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky dang xa hoi. ((hieu ve) or (hieu van)) cam tuc va ((hanh hai) OR (nhanh hai)) cua tre*.