Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham truc » cau truc, nham thuc, pham thuc
van nang » van quang, van dong, van dung
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
cua tre » cua te, cuu tre, dua tren
hanh de » hanh ve, hanh kem
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
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) OR (van ban)) o hoi. hieu ve cham truc van hanh de ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((van nang) OR (van ban)) o hoi. hieu ve cham truc van hanh de ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((van nang) OR (van ban)) o hoi. hieu ve cham truc van hanh de ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((van nang) OR (van ban)) o hoi. hieu ve cham truc van hanh de ((cua tre) or (cua triet))*.