Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
cach hoi » cach thoi, cach noi, cach hoc
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
van tuan » van quan, van ban, anh tuan
tu cach » tu cac
van tai » von tai
hoa va » hoa van, hoa xa, hoa vo

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 dap, nghien cua cong hoc nganh khoa hoc ma hoa va ((van tai) or (van tuan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach hoi dap, nghien cua cong hoc nganh khoa hoc ma hoa va ((van tai) OR (van tuan)).
• Adding a wildcard symbol may retrieve word variants: tu cach hoi dap, nghien cua cong hoc nganh khoa hoc ma hoa va ((van tai) or (van tuan))*.