Perhaps you should try some spelling variations:
thuyet mach » thuyet xac, thuyet cac, thuyet anh
thuat mach » thuat sach, thuat tach, thuat lanh
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
phap dau » phan dau, phap day, pham dau
va phap » va phat, 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) OR (thuyet mach)) hoc tap, nghien cuu cong hoc nganh khoa hoc ma hoi va phap dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat mach) OR (thuyet mach)) hoc tap, nghien cuu cong hoc nganh khoa hoc ma hoi va phap dau".
• Adding a wildcard symbol may retrieve word variants: ((thuat mach) OR (thuyet mach)) hoc tap, nghien cuu cong hoc nganh khoa hoc ma hoi va phap dau*.