Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh tri » thanh tri, hanh tai, hanh trinh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
so sac » so sach, so dac
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va

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 xuc va hanh tri ((cua tre) OR (cuu 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 xuc va hanh tri ((cua tre) OR (cuu 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 xuc va hanh tri ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sac ky nang xa hoi. ((hieu van) or (hieu va)) bac xuc va hanh tri ((cua tre) OR (cuu tre))*.