Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
coc nganh » hoc nganh, cac nganh, chuc nganh
khong hoc » khung hoc, thong hoc, khong thuoc
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 sach
tu hach » tu hanh, tu cach, tu sach
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) OR (tu hach)) hoc tap, nghien thu cong coc nganh khong hoc ma hoa van gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu mach) OR (tu hach)) hoc tap, nghien thu cong coc nganh khong hoc ma hoa van gian dan".
• Adding a wildcard symbol may retrieve word variants: ((tu mach) OR (tu hach)) hoc tap, nghien thu cong coc nganh khong hoc ma hoa van gian dan*.