Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, vanh dai, thanh dat
hanh dao » lanh dao, thanh dat, thanh dam
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky

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 ma hoa. hieu va ((dat nuoc) or (hoc nuoc)) van ((hanh dai) OR (hanh dao)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ma hoa. hieu va ((dat nuoc) OR (hoc nuoc)) van ((hanh dai) OR (hanh dao)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang ma hoa. hieu va ((dat nuoc) or (hoc nuoc)) van ((hanh dai) OR (hanh dao)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ma hoa. hieu va ((dat nuoc) or (hoc nuoc)) van ((hanh dai) OR (hanh dao)) cua triet*.