Perhaps you should try some spelling variations:
khanh hoa » thanh hoa, hang hoa
mach hoc » cach hoc, dich hoc, anh hoc
cong cac » cuong cac, cong cau, trong cac
cong tac » cong ty
phap dan » phap day, phap han, phap van
tu mach » tu cach, tu manh, tu hach
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: tu mach hoc tap, nghien cuu ((cong cac) or (cong tac)) khanh hoa hoc ma hoi va phap dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu ((cong cac) OR (cong tac)) khanh hoa hoc ma hoi va phap dan.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu ((cong cac) or (cong tac)) khanh hoa hoc ma hoi va phap dan*.