Perhaps you should try some spelling variations:
trung thuoc » trung thuc, trung quoc, trung hoc
thuoc mach » thuoc sach, thuong mach, thuoc ma
mach trung » manh trung, mach thuong, dac trung
ban khong » ban phuong, benh khong, hang khong
bay khong » hay khong, va khong, ta khong
san khong » sao khong, hang khong, nhan khong
ban thong » ban trong, ban tuong, ban tong
khi tuong » khai thuong, khoi truong, thi truong

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc mach trung thuoc ((((((ban khong) OR (bay khong))) or (san khong))) or (ban thong)) khi tuong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc mach trung thuoc ((((((ban khong) OR (bay khong))) OR (san khong))) OR (ban thong)) khi tuong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc mach trung thuoc ((((((ban khong) OR (bay khong))) or (san khong))) or (ban thong)) khi tuong".
• Adding a wildcard symbol may retrieve word variants: thuoc mach trung thuoc ((((((ban khong) OR (bay khong))) or (san khong))) or (ban thong)) khi tuong*.