Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dieu hien » dieu khien, dieu kien, bieu hien
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
tuc dan » thuc dan, thuc day, tung dan
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
tu dan » tu ban, cu dan, tu can
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu dan) OR (tuc dan)) ky nang x ho. ((hieu vien) or (dieu hien)) cac tuc va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu dan) OR (tuc dan)) ky nang x ho. ((hieu vien) OR (dieu hien)) cac tuc va hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu dan) OR (tuc dan)) ky nang x ho. ((hieu vien) or (dieu hien)) cac tuc va hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu dan) OR (tuc dan)) ky nang x ho. ((hieu vien) or (dieu hien)) cac tuc va hanh dai cua triet*.