Perhaps you should try some spelling variations:
nghien ha » nghiep ha, nghiem hoa, nghiep nha
phan khoa » pham khoa, nhan khoa, phan hoa
mach hoc » cach hoc, dich hoc, anh hoc
dong hoa » dong hoc, dong co
hoa phan » hoa dan, co phan
khoa hoc » hoa hoc
dan chan » dan ca, van chat
tu mach » tu cach, tu manh, tu hach
ha dong » hoat dong, van dong
va hoc » van hoc

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 ha dong hoa phan khoa hoc va hoc ((dan chan) OR (dan gian)) va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien ha dong hoa phan khoa hoc va hoc ((dan chan) OR (dan gian)) va".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien ha dong hoa phan khoa hoc va hoc ((dan chan) OR (dan gian)) va*.