Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
nghien huu » nghien cuu, nguyen huu, nhiem huu
hoc nganh » hoc nhanh
nganh hoa » thanh hoa, khanh hoa, danh hoa
toc sach » hoc sach, doc sach, thuoc sach
huu toan » huu tuan, cuu toan, huy toan
toan hoc » toan khoa, van hoc, tin hoc
van phan » van phong, van thanh, luan phan
phan dan » phan dang, phan dau, nhan dan
hai van » thai van, ha van, hai tan
ma hai » ta hai, va hai, xa hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat lanh) or (toc sach)) hoc tap, nghien huu toan hoc nganh hoa hoc ma hai van phan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat lanh) OR (toc sach)) hoc tap, nghien huu toan hoc nganh hoa hoc ma hai van phan dan.
• Adding a wildcard symbol may retrieve word variants: ((thuat lanh) or (toc sach)) hoc tap, nghien huu toan hoc nganh hoa hoc ma hai van phan dan*.