Perhaps you should try some spelling variations:
quyen tai » xuyen tai, nguyen tai, truyen tai
cac chien » cuoc chien, van chien
nam chien » nam hien, nam chi, van chien
cong bang » cuong bang, dong bang, hong bang
co bang » cao bang, con bang, co ban
ky thu » ly thu, ky thi, ky thuat
ly ky » ly y
dong* » dung*

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

• Performing a fuzzy search may retrieve terms with similar spellings: quyen tai ((cac chien) OR (nam chien)) đe ((co bang) or (cong bang)) ly ky thu cong dong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tai ((cac chien) OR (nam chien)) đe ((co bang) OR (cong bang)) ly ky thu cong dong*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tai ((cac chien) OR (nam chien)) đe ((co bang) or (cong bang)) ly ky thu cong dong*".