Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh khoa » nganh hoa, nganh khong, doanh khoa
cach thoi » cac thoi, cach thuc, cach noi
hoc nganh » hoc nhanh
thoi dai » hoc dai, hoi dap, hoi dan
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 vo » hoa co

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