Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
than khai » than khoi, tuan khai, than thoai
su triet » su viet, su tien, ve triet
san than » sang than, san thanh, ban than
nuoc san » nuoc luan, nguoi san, nuoc quan
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
sac ky » cac ky
ve dat » de dat, va dat, ve dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sac ky) or (sai ky)) lang xa hoi. hieu ve dat nuoc san than khai ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sai ky)) lang xa hoi. hieu ve dat nuoc san than khai ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sai ky)) lang xa hoi. hieu ve dat nuoc san than khai ((cua triet) or (su triet))*.