Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
cam truc » cau truc, nam truc, lam truoc
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, dua tren
nang o » nang co, nang ho, nang ro
ve cam » ve cham, ve cac, va cam
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 cam truc va hanh de ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van nang o hoi. hieu ve cam truc va hanh de ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach van nang o hoi. hieu ve cam truc va hanh de ((cua tre) or (cua triet))*.