Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
sach thu » sach thue, sach thieu, sach tham
cau thuc » cau truc, cuu thuc, can thuc
thanh va » thanh van, hanh va, thanh ha
hieu va » lieu va
su tien » su kien, su hien, tu tieng
sai ky » sac ky
x hoi » xa hoi, o hoi, x ho

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 thu) or (sai ky)) nang x hoi. ((hieu va) or (hieu qua)) cau thuc vat thanh va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sai ky)) nang x hoi. ((hieu va) OR (hieu qua)) cau thuc vat thanh va su tien.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sai ky)) nang x hoi. ((hieu va) or (hieu qua)) cau thuc vat thanh va su tien*.