Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
hieu van » hieu va, lieu va, hieu ve
hanh vai » hanh vi, hanh tai, hanh van
hanh va » hang va, hanh vi
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. ((hieu van) or (thien van)) cac loc va ((hanh vai) OR (hanh va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. ((hieu van) OR (thien van)) cac loc va ((hanh vai) OR (hanh va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. ((hieu van) or (thien van)) cac loc va ((hanh vai) OR (hanh va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. ((hieu van) or (thien van)) cac loc va ((hanh vai) OR (hanh va)) cua triet*.