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
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac dac » cac dan, cac dai, cac bac
va hanh » van hanh, va thanh, va danh
nang o » nang co, nang ho, nang ro
dac va » duc va, day va, dat va
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang o hoi. ((hieu vien) or (hieu hien)) cac dac va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. ((hieu vien) OR (hieu hien)) cac dac va hanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. ((hieu vien) or (hieu hien)) cac dac va hanh dai cua triet*.