Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
coc nganh » hoc nganh, cac nganh, chuc nganh
khong hoc » thong hoc, khong thuoc, khong chuc
khung hoc » chung hoc, nhung hoc, thuong hoc
mach hoc » cach hoc, dich hoc, anh hoc
cong coc » cong cuoc, cong cac, cong co
van gian » van giang, dan gian, van giao
gian dan » gian lang
tu mach » tu cach, tu manh, tu hach
hoa van » hoa dan, hoang van, hoa phan

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