Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach van » sach han, sach va, bach van
cam truc » cau truc, nam truc, lam truoc
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, dua tren
dong x » dong xa, dong y, dong o
va cam » va cham, va cac, va cao
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: su sach van dong x hoi. hieu va cam 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 dong x hoi. hieu va cam truc van hanh de ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach van dong x hoi. hieu va cam truc van hanh de ((cua tre) or (cua triet))*.