Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
cong chuc » cong thuc, cong cu
khong hoc » khung hoc, thong hoc, khong thuoc
mach hoc » cach hoc, dich hoc, anh hoc
cong cua » cong cu, dong cua, huong cua
gian dan » gian lang
tu mach » tu cach, tu manh, tu hach
va gian » va gianh, van gian, va giai
hoa va » hoa van, hoa xa, hoa vo

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