Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
sach vuc » sach duoc, sach nuoc, sach truc
sach dao » lanh dao
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
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: su ((sach vuc) or (sach dao)) nang x hoi. hieu ve cham thuc vat ((hanh di) OR (hanh de)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vuc) OR (sach dao)) nang x hoi. hieu ve cham thuc vat ((hanh di) OR (hanh de)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach vuc) or (sach dao)) nang x hoi. hieu ve cham thuc vat ((hanh di) OR (hanh de)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach vuc) or (sach dao)) nang x hoi. hieu ve cham thuc vat ((hanh di) OR (hanh de)) cuu tre*.