Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dung con » dung cong, dung co, dung dong
con cua » cong cua, co cua, dong cua
sach ty » sach tu, sach thu, xach tay
qua nam » quan nam, cua nam, quang nam
tu vat » tu va, tu van, tu dat
tu bat » tu ban, tu dat
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach y)) nang x hoi. hieu qua nam ((tu vat) OR (tu bat)) dung con cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang x hoi. hieu qua nam ((tu vat) OR (tu bat)) dung con cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) nang x hoi. hieu qua nam ((tu vat) OR (tu bat)) dung con cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang x hoi. hieu qua nam ((tu vat) OR (tu bat)) dung con cua triet*.