Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
cau thuc » cau truc, cuu thuc, can thuc
toc sach » hoc sach, doc sach, thuoc sach
nhanh ha » thanh hoa, khanh hoa, nhan va
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (toc sach)) ky nang ma hoi. hieu van cau thuc va ((nhanh ha) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang ma hoi. hieu van cau thuc va ((nhanh ha) OR (thanh hai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang ma hoi. hieu van cau thuc va ((nhanh ha) or (thanh hai)) cua tre*.