Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dao, sach dung
cham thuc » pham thuc, tham thuc, pham thuoc
nham thuc » nhan thuc, nam thuc, nham thu
vat thanh » dat thanh, gat thanh, tat thanh
sach vuc » sach nuoc, sach truc, sach bac
thanh di » thanh doi, thanh de, thanh do
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu

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 duoc)) nang x ho. hieu ve ((cham thuc) OR (nham thuc)) vat thanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vuc) OR (sach duoc)) nang x ho. hieu ve ((cham thuc) OR (nham thuc)) vat thanh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach vuc) or (sach duoc)) nang x ho. hieu ve ((cham thuc) OR (nham thuc)) vat thanh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach vuc) or (sach duoc)) nang x ho. hieu ve ((cham thuc) OR (nham thuc)) vat thanh di cuu tre*.