Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu hien » bieu hien, dieu hien, chieu chien
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
hien cac » thien cac, vien cac, hieu cac
hoc van » hoc dan, hoc va, hoc vat
cac hoc » cach hoc, cac hop, bac hoc
su sach » so sach
nang xa » nang x, nang ma, mang xa
vu sach » vu bach, vu khach
lang xa » lang ha, dang xay, lang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ky ((nang xa) OR (lang xa)) hoi. hieu hien cac hoc van hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky ((nang xa) OR (lang xa)) hoi. hieu hien cac hoc van hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky ((nang xa) OR (lang xa)) hoi. hieu hien cac hoc van hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky ((nang xa) OR (lang xa)) hoi. hieu hien cac hoc van hanh dai cua triet*.