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, dich hoc, anh 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
tu mach » tu cach, tu manh, tu hach

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