Perhaps you should try some spelling variations:
pham trang » pham trong, pham trung, pham thang
sach pham » sach tham, sach phat, sach phap
cau thuc » cau truc, cuu thuc, cau phuc
can thuc » dan thuc, van thuc, cay thuc
trang va » tran van, hang va
hieu van » hieu va, thien van, lieu va
danh vi » dinh vi, danh di, danh va
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
va hoi » xa hoi, va hoc, va 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 pham trang va hoi. hieu van ((cau thuc) OR (can thuc)) vat ((danh vi) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach pham trang va hoi. hieu van ((cau thuc) OR (can thuc)) vat ((danh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach pham trang va hoi. hieu van ((cau thuc) OR (can thuc)) vat ((danh vi) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach pham trang va hoi. hieu van ((cau thuc) OR (can thuc)) vat ((danh vi) or (hanh vi)) cua tre*.