Perhaps you should try some spelling variations:
tuyen tai » truyen tai, tuyen tap, nguyen tai
xuyen tai » xuyen tac, nguyen tai, truyen tai
cong cong » trong cong, dung cong, dang cong
cac khu » cac thu, cac khoi, cac kieu
ky thua » ky thuat, ky thu, kxy thuat
ban ke » ban kem, ban ve, ban le
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: ((tuyen tai) or (xuyen tai)) cac khu đe co ban ke ky thua ((cong cong) OR (cong dong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tuyen tai) OR (xuyen tai)) cac khu đe co ban ke ky thua ((cong cong) OR (cong dong)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tuyen tai) or (xuyen tai)) cac khu đe co ban ke ky thua ((cong cong) OR (cong dong))".
• Adding a wildcard symbol may retrieve word variants: ((tuyen tai) or (xuyen tai)) cac khu đe co ban ke ky thua ((cong cong) OR (cong dong))*.