Perhaps you should try some spelling variations:
con nguoi » cua nguoi, cho nguoi
dai nguoi » dao nguoi, doi nguoi, dau nguoi
may nguoi » tay nguoi, ma nguoi, lay nguoi
hanh hoc » thanh hoc, hinh hoc, anh hoc
tri benh » tai benh, tri kinh
benh hoc » sinh hoc
hach hoc » cach hoc, mach hoc, hoach hoi
tu hanh » du hanh, lu hanh, thuc hanh
hoc con » hoc cong, hoc cuon, hoc co
hoc dai » hoc dan
tu hach » tu cach, tu sach, vu khach
hoc may » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( tu hanh hoc con nguoi ) or ( tri benh hoc dai nguoi ))) or ( tu hach hoc may nguoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( tu hanh hoc con nguoi ) OR ( tri benh hoc dai nguoi ))) OR ( tu hach hoc may nguoi )).
• Adding a wildcard symbol may retrieve word variants: (((( tu hanh hoc con nguoi ) or ( tri benh hoc dai nguoi ))) or ( tu hach hoc may nguoi ))*.