Perhaps you should try some spelling variations:
cuc triet » cua triet, su triet, cac trieu
thien van » thi van
hanh tai » thanh tai, hang tai, han tai
van cham » van chat, van tham, va cham
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
san ky » sang ky, van ky, dan ky
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
tu san » thu san, tu ban, tu can

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

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