Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
hanh doi » thanh doi, hanh noi, hang doi
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
cac truc » cau truc, cac tru, cac trung
qua cac » cua cac
sach uu » sach luu, sach tu, sach xu
uu nang » cuu nang, vu nang, cuu nong
su sach » so sach, vu sach
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 uu nang ((x hoi) OR (o hoi)). hieu qua cac truc van hanh doi ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach uu nang ((x hoi) OR (o hoi)). hieu qua cac truc van hanh doi ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach uu nang ((x hoi) OR (o hoi)). hieu qua cac truc van hanh doi ((cua triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: su sach uu nang ((x hoi) OR (o hoi)). hieu qua cac truc van hanh doi ((cua triet) or (su triet))*.