Perhaps you should try some spelling variations:
phung cong » nhung cong, phong cong, nhung chong
nguyen tac » nguyen thi, nguyen van, nguyen duc
hung cong » nhung cong, hung cuong, dung cong
cuc chu » cua chu, cac chu, coc chiu
ky tien » ky bien, ly tien, may tien
ban ve » ban va
ve ky » va ky, ke ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: nguyen tac ((cuc chu) or (cuc thue)) đe co ban ve ky tien ((hung cong) or (phung cong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nguyen tac ((cuc chu) OR (cuc thue)) đe co ban ve ky tien ((hung cong) OR (phung cong)).
• Adding a wildcard symbol may retrieve word variants: nguyen tac ((cuc chu) or (cuc thue)) đe co ban ve ky tien ((hung cong) or (phung cong))*.