Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
truc van » truc va, thuc van, truc ban
hanh doi » thanh doi, hanh noi, hang doi
van hanh » van thanh, ban hanh, van anh
sach cuu » sach cua, sach luu, sach cap
cac truc » cau truc, cac tru, cac trung
sach uu » sach luu, sach tu, sach xu
qua cac » cua cac
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: so ((sach cuu) OR (sach uu)) nang x hoi. hieu qua cac truc van hanh doi ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach cuu) OR (sach uu)) nang x hoi. hieu qua cac truc van hanh doi ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach cuu) OR (sach uu)) nang x hoi. hieu qua cac truc van hanh doi ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: so ((sach cuu) OR (sach uu)) nang x hoi. hieu qua cac truc van hanh doi ((cua triet) or (cua viet))*.