Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh tai » thanh tai, hang tai, han tai
hanh tri » thanh tri, hanh trinh, hanh triet
cua tre » cua te, cuu tre, cua triet
bac luc » bao luc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
so sac » so sach, so dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky nang xa hoi. ((hieu van) or (hieu va)) bac luc va ((hanh tri) OR (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang xa hoi. ((hieu van) OR (hieu va)) bac luc va ((hanh tri) OR (hanh tai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky nang xa hoi. ((hieu van) or (hieu va)) bac luc va ((hanh tri) OR (hanh tai)) cua tre*".