Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc quan, quoc binh
quoc lan » nuoc luan, quoc quan, quoc danh
nang xa » nang x, lang xa, nang ma
van cao » van dao, van bao, van hao
cua tre » cua te, cuu tre, dua tren
ban vi » ban voi, ban va, ban ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang xa hoi. hieu van cao ((quoc ban) OR (quoc lan)) ban vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang xa hoi. hieu van cao ((quoc ban) OR (quoc lan)) ban vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang xa hoi. hieu van cao ((quoc ban) OR (quoc lan)) ban vi ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang xa hoi. hieu van cao ((quoc ban) OR (quoc lan)) ban vi ((cua tre) or (cua triet))*.