Perhaps you should try some spelling variations:
van nang » van quang, van dong, van dung
cam truc » cau truc, nam truc, lam truoc
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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)) xa hoi. hieu ve cam truc van hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((van nang) OR (van ban)) xa hoi. hieu ve cam truc van hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((van nang) or (van ban)) xa hoi. hieu ve cam truc van hanh doi cua tre*.