Perhaps you should try some spelling variations:
thien van » thi van
va triet » va thiet, va trien, ve triet
hanh dao » lanh dao, thanh dat, thanh dam
hanh dai » hanh tai, vanh dai, thanh dat
cac loc » cac lop, cac toc, cac hoc
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
loc va » hoc va, luc va
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang xa hoi. ((lieu va) or (thien van)) cac loc va ((hanh dai) OR (hanh dao)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. ((lieu va) OR (thien van)) cac loc va ((hanh dai) OR (hanh dao)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. ((lieu va) or (thien van)) cac loc va ((hanh dai) OR (hanh dao)) va triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. ((lieu va) or (thien van)) cac loc va ((hanh dai) OR (hanh dao)) va triet*.