Perhaps you should try some spelling variations:
hang truc » khung truc
van thanh » ban thanh, van tuan
van hang » van khang, van hoang, van thang
van hanh » ban hanh, van anh, van ban
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi
vi cua » vai cua, di cua

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 ky nang ((ma hoi) OR (xa hoi)). hieu van hang truc ((van hanh) or (van thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((ma hoi) OR (xa hoi)). hieu van hang truc ((van hanh) OR (van thanh)) vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) OR (xa hoi)). hieu van hang truc ((van hanh) or (van thanh)) vi cua tre*".