Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
cap nuoc » dat nuoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
san ky » sang ky, van ky, dan ky
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. hieu va ((cap nuoc) or (hoc nuoc)) van hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((nang xa) OR (nang ma)) hoi. hieu va ((cap nuoc) OR (hoc nuoc)) van hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((nang xa) OR (nang ma)) hoi. hieu va ((cap nuoc) or (hoc nuoc)) van hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((nang xa) OR (nang ma)) hoi. hieu va ((cap nuoc) or (hoc nuoc)) van hanh dai cua triet*.