Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu vien » hieu viec, thieu nien, hieu tieng
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
thuc va » thuc vat, thuc dan, thuc day
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
tuc va » truc va, tuc xa, duc va

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

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