Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
coc nganh » hoc nganh, cac nganh, chuc nganh
khong hoc » khung hoc, thong hoc, khong thuoc
hoang van » hang va
mach hoc » cach hoc, anh hoc, bac hoc
dich hoc » sinh hoc, hinh hoc, tinh hoc
cuu cong » cua cong, thu cong, cac cong
cong coc » cong cuoc, cong cac, cong co
ma hoang » mai hoang, m hoang, van hoang
van gian » van giang, dan gian, van giao
gian dan » gian lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((mach hoc) OR (dich hoc)) tap, nghien cuu cong coc nganh khong hoc ma hoang van gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((mach hoc) OR (dich hoc)) tap, nghien cuu cong coc nganh khong hoc ma hoang van gian dan".
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) OR (dich hoc)) tap, nghien cuu cong coc nganh khong hoc ma hoang van gian dan*.