Perhaps you should try some spelling variations:
trung van » truong van, trong van, trung va
cau trung » cau truong, cac trung, cao trung
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty xang, ty hang
so sanh » do sanh
ma hoi » xa hoi, ma hoa, me hoi
va cau » van cau, va cac, va dau
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) or (so sanh)) ty nang ((ma hoi) OR (mai hoi)). lieu va cau trung van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ty nang ((ma hoi) OR (mai hoi)). lieu va cau trung van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ty nang ((ma hoi) OR (mai hoi)). lieu va cau trung van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ty nang ((ma hoi) OR (mai hoi)). lieu va cau trung van hanh vi cua tre*.