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