Perhaps you should try some spelling variations:
sach kha » sach nha, sach ha, sach tham
kha nang » phap nang, ky nang, ki nang
cam thuc » am thuc, nam thuc, cam thu
thai cua » than cua, tai cuc, tri cua
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
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: su sach kha nang ma hoi. hieu va cam thuc va hanh ((di cua) or (thai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach kha nang ma hoi. hieu va cam thuc va hanh ((di cua) OR (thai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach kha nang ma hoi. hieu va cam thuc va hanh ((di cua) or (thai cua)) triet*.