Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
va phap » ban phap
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat mach hoc tap, nghien cuu cong hoc nganh khoa hoc ma hoi ((va phap) OR (va phat)) dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat mach hoc tap, nghien cuu cong hoc nganh khoa hoc ma hoi ((va phap) OR (va phat)) dau".
• Adding a wildcard symbol may retrieve word variants: thuat mach hoc tap, nghien cuu cong hoc nganh khoa hoc ma hoi ((va phap) OR (va phat)) dau*.