Perhaps you should try some spelling variations:
lieu nguoi » lieu nguon, dien nguoi, le nguoi
tay nguoi » toc nguoi
dao nguoi » cho nguoi
duoc lieu » du lieu
mach hoc » cach hoc, anh hoc, bac hoc
dich hoc » sinh hoc, hinh hoc, tinh hoc
cac duoc » cac nuoc, cac cuoc, cac quoc

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) OR (dich hoc)) ((tay nguoi) or (dao nguoi)) ) or ( tu cac duoc lieu nguoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu ((mach hoc) OR (dich hoc)) ((tay nguoi) OR (dao nguoi)) ) OR ( tu cac duoc lieu nguoi )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu ((mach hoc) OR (dich hoc)) ((tay nguoi) or (dao nguoi)) ) or ( tu cac duoc lieu nguoi ))".
• Adding a wildcard symbol may retrieve word variants: (( tu ((mach hoc) OR (dich hoc)) ((tay nguoi) or (dao nguoi)) ) or ( tu cac duoc lieu nguoi ))*.