Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
hang hai » hoang hai, hang tai, thanh hai
hanh hai » thanh hai, nhanh hai, hanh tai
hac xuc » chat xuc
nang xa » nang x, lang xa, nang ma
su dai » sau dai, si dai, su tai
dai ky » dan ky, dai ly, sai ky
xuc va » duc va, tuc va, luc va
cua su » qua su

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 nang xa hoi. ((hieu van) OR (thien van)) hac xuc va ((hanh hai) or (hang hai)) cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dai ky nang xa hoi. ((hieu van) OR (thien van)) hac xuc va ((hanh hai) OR (hang hai)) cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su dai ky nang xa hoi. ((hieu van) OR (thien van)) hac xuc va ((hanh hai) or (hang hai)) cua su".
• Adding a wildcard symbol may retrieve word variants: su dai ky nang xa hoi. ((hieu van) OR (thien van)) hac xuc va ((hanh hai) or (hang hai)) cua su*.