Perhaps you should try some spelling variations:
su triet » su viet, ve triet
phan lap » phan dau
su tien » su kien, su hien, tu tieng
va phan » van phan, va phat, va phap
ky cong » ke cong, ly cong, khu cong
cong ha » cong hoa, dong ha, cong tac
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac nuoc
cac dac » cac dan, cac dai, cac bac
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky cong ha hoi. hieu ve ((cac duc) or (cac dac)) va phan lap ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky cong ha hoi. hieu ve ((cac duc) OR (cac dac)) va phan lap ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky cong ha hoi. hieu ve ((cac duc) or (cac dac)) va phan lap ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: su xac ky cong ha hoi. hieu ve ((cac duc) or (cac dac)) va phan lap ((su triet) OR (su tien))*.