Perhaps you should try some spelling variations:
khoa nganh » khoi nganh, hoc nganh
nganh cong » nhanh chong, thanh cong
van thanh » ban thanh, van tuan
thanh van » thanh san, thanh toan, thanh phan
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
cuu toan » cuu hoan, cua toan, huu toan
thuoc va » thuc va, thuong va, thuoc tai
thuoc ma » hoc ma, duoc ma
hoc van » hoc dan, hoc va, hoc vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu mach hoc tap, nghien cuu toan khoa nganh cong ((thuoc va) OR (thuoc ma)) hoc van thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu mach hoc tap, nghien cuu toan khoa nganh cong ((thuoc va) OR (thuoc ma)) hoc van thanh van".
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu toan khoa nganh cong ((thuoc va) OR (thuoc ma)) hoc van thanh van*.