Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
nganh khoa » nganh hoa, nganh khong, doanh khoa
huu quang » vu quang, huu tung, chu quang
quang hoc » quang hoi, quang huy, dung hoc
hoc nganh » hoc nhanh
khoa hoc » hoa hoc
te sach » toc sach
doi tap » doi tac, doi dap, doi tan
doi tai » hoi tai, dai tai, doi tac
hoc gia » hoc giao, hoc giai, toc gia
hoc xa » hoc ma
xa hoc » xa hoi, va hoc, xa hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((doi tap) or (doi tai)), nghien huu quang hoc nganh khoa hoc xa hoc gia thanh san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((doi tap) OR (doi tai)), nghien huu quang hoc nganh khoa hoc xa hoc gia thanh san.
• Adding a wildcard symbol may retrieve word variants: te sach ((doi tap) or (doi tai)), nghien huu quang hoc nganh khoa hoc xa hoc gia thanh san*.