Perhaps you should try some spelling variations:
thai nguoi » thanh nguoi, thang nguoi, thuat nguoi
phai nguoi » phau nguoi, loai nguoi, nhan nguoi
cao nguoi » cho nguoi, dao nguoi, ca nguoi
sach toc » bach tuoc, sach duoc, sach nuoc
te sach » toc sach
anh hoc » sinh hoc, benh hoc, hinh hoc
tu anh » tu hanh, tu manh, thu anh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach toc ((thai nguoi) OR (phai nguoi)) ) or ( tu anh hoc cao nguoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach toc ((thai nguoi) OR (phai nguoi)) ) OR ( tu anh hoc cao nguoi )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach toc ((thai nguoi) OR (phai nguoi)) ) or ( tu anh hoc cao nguoi ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach toc ((thai nguoi) OR (phai nguoi)) ) or ( tu anh hoc cao nguoi ))*.