Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam truc » cau truc, nam truc, lam truoc
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 » vu sach
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, co sach
dong x » dong xa, dong y, dong o
ve cam » ve cham, ve cac, va cam
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) OR (so sach)) van dong x hoi. hieu ve 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) OR (so sach)) van dong x hoi. hieu ve cam truc van hanh de ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) van dong x hoi. hieu ve cam truc van hanh de ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) van dong x hoi. hieu ve cam truc van hanh de ((cua tre) or (cua triet))*.