Perhaps you should try some spelling variations:
sach pham » sach tham, sach phat, sach phap
hieu van » hieu va, thien van, lieu va
thang va » hang va, thong va, thanh va
trang va » tran van, hang va
cau thuc » cau truc, cuu thuc, can thuc
danh vi » dinh vi, danh di, danh va
te sach » toc sach
van cau » van dau, van hau, van chat
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach pham ((thang va) or (trang va)) hoi. hieu van cau thuc vat ((danh vi) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach pham ((thang va) OR (trang va)) hoi. hieu van cau thuc vat ((danh vi) OR (hanh vi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach pham ((thang va) or (trang va)) hoi. hieu van cau thuc vat ((danh vi) or (hanh vi)) cuu tre*.