Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoach hoc » hoach hoi, hoach hoa, hoa hoc
toan hoc » toan khoa, van hoc, hoa hoc
khoa hoc » hoa hoc
dung co » dung cho, dung cong, dung cua
hoa van » hoa dan, hoang van, hoa phan
van van » van ban, tan van, san van
van tai » von tai, van tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu hoach hoc tap, nghien cuu ((toan hoc) or (dung co)) nganh khoa hoc ma hoa van van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu hoach hoc tap, nghien cuu ((toan hoc) OR (dung co)) nganh khoa hoc ma hoa van van tai.
• Adding a wildcard symbol may retrieve word variants: thu hoach hoc tap, nghien cuu ((toan hoc) or (dung co)) nganh khoa hoc ma hoa van van tai*.