Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham thuc » nham thuc, pham thuc, pham thuoc
day thanh » dao thanh, dat thanh, da thanh
cua thuoc » nha thuoc, cay thuoc, cua nuoc
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
thanh va » thanh van, hanh va, thanh ha
so sach » so sanh, bo sach, co sach
hang ma » hang va, hang ca, tang ma
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thu hang ma hoi. hieu ve ((cham thuc) OR (tham thuc)) day thanh va cua thuoc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu hang ma hoi. hieu ve ((cham thuc) OR (tham thuc)) day thanh va cua thuoc".
• Adding a wildcard symbol may retrieve word variants: so sach thu hang ma hoi. hieu ve ((cham thuc) OR (tham thuc)) day thanh va cua thuoc*.