Perhaps you should try some spelling variations:
thien van » thi van
thanh hai » thanh phan, thanh hoa, thanh san
dan thanh » dang thanh, danh thanh, ban thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cac thuc » cach thuc, cac thu, can thuc
hai cua » thai cua, dai cua, hoi cua
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
ky lang » ky dang, ky tang, tay lang
su sach » so sach, vu sach
su sac » su cac, su xac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) OR (su sach)) ((ky lang) or (ky nang)) xa hoi. thien van cac thuc dan thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su sach)) ((ky lang) OR (ky nang)) xa hoi. thien van cac thuc dan thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su sach)) ((ky lang) or (ky nang)) xa hoi. thien van cac thuc dan thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su sach)) ((ky lang) or (ky nang)) xa hoi. thien van cac thuc dan thanh hai cua tre*.