Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
sach thu » sach thue, sach thieu, sach tham
van hang » van khang, van hoang, van thang
thuc van » thuc vat, thuc dan, thuc va
thu nang » thi nang, thu hang, thu bang
nang xa » nang x, lang xa, nang ma
hang di » hang doi, hang vi, hang dien
so sach » so sanh, bo sach, co sach
ve nam » he nam, le nam, te nam
va nam » van nam, ha nam, va nay

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu nang xa hoi. hieu ((ve nam) OR (va nam)) thuc van hang di ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu nang xa hoi. hieu ((ve nam) OR (va nam)) thuc van hang di ((cua triet) or (su triet))~".
• Adding a wildcard symbol may retrieve word variants: so sach thu nang xa hoi. hieu ((ve nam) OR (va nam)) thuc van hang di ((cua triet) or (su triet))*.