Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
truc van » truc va, thuc van, truc ban
van nang » van quang, van ban, van dong
sach van » sach han, sach va, bach van
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hanh de » hanh ve, hanh kem
cua tu » cua tuc, cua su, cua cu
ke cau » ket cau
ve cau » va cau, ve cac, le cau
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 van nang o hoi. hieu ((ve cau) OR (ke cau)) truc van hanh de ((cua triet) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van nang o hoi. hieu ((ve cau) OR (ke cau)) truc van hanh de ((cua triet) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach van nang o hoi. hieu ((ve cau) OR (ke cau)) truc van hanh de ((cua triet) or (cua tu))*".