Perhaps you should try some spelling variations:
quyen tai » nguyen tai, truyen tai, luyen thi
xuyen tai » xuyen tac, nguyen tai, truyen tai
cong cong » cong dong, trong cong, dung cong
cac khu » cac thu, cac khoi, cac kieu
ban le » ban ve
ky thu » ly thu, ky thi, ky thuat
y thu » ly thu, y thuc, _ thu

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) or (xuyen tai)) cac khu đe co ban le ((y thu) OR (ky thu)) cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((quyen tai) OR (xuyen tai)) cac khu đe co ban le ((y thu) OR (ky thu)) cong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((quyen tai) or (xuyen tai)) cac khu đe co ban le ((y thu) OR (ky thu)) cong cong".
• Adding a wildcard symbol may retrieve word variants: ((quyen tai) or (xuyen tai)) cac khu đe co ban le ((y thu) OR (ky thu)) cong cong*.