Perhaps you should try some spelling variations:
nham nang » phap nang, cam nang, kha nang
sach nham » sach nha, sach tham, sach han
nam thuc » nam thuoc, am thuc, nam thu
cam thuc » am thuc, cam thu, can thuc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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 nham nang ma hoi. hieu ve ((cam thuc) OR (nam thuc)) va hanh ((di cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach nham nang ma hoi. hieu ve ((cam thuc) OR (nam thuc)) va hanh ((di cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach nham nang ma hoi. hieu ve ((cam thuc) OR (nam thuc)) va hanh ((di cua) or (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach nham nang ma hoi. hieu ve ((cam thuc) OR (nam thuc)) va hanh ((di cua) or (vai cua)) triet*.