Perhaps you should try some spelling variations:
thanh chuong » thanh huong, thanh cong, nhanh chong
nhanh chuong » nhanh chong, thanh huong, thanh cuong
cach hoi » cach thoi, cach noi, cach hoc
cuu cong » cua cong, thu cong, cac cong
cong hoa » dong hoa, dong hoc, hang hoa
hai benh » tai benh, hai binh, hap benh
nhan dan » phan dau, gian dan, nhan tai
tu cach » tu cac
hoi dan » hoa dan, hoc dan, hoi dap
hoc tan » hoc tang, hoc dan, hoc tap
tan hai » tran hai, van hai, tai hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach hoi dan, nghien cuu cong hoa ((nhanh chuong) or (thanh chuong)) hoc tan hai benh nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach hoi dan, nghien cuu cong hoa ((nhanh chuong) OR (thanh chuong)) hoc tan hai benh nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu cach hoi dan, nghien cuu cong hoa ((nhanh chuong) or (thanh chuong)) hoc tan hai benh nhan dan*.