Perhaps you should try some spelling variations:
sach phap » sach phat, sach nha, sach tham
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
di cua » dai cua, doi cua, de 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 phap nang ma hoi. hieu ve cam thuc van hanh ((di cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach phap nang ma hoi. hieu ve cam thuc van hanh ((di cua) OR (vai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: so sach phap nang ma hoi. hieu ve cam thuc van hanh ((di cua) or (vai cua)) triet*.