Perhaps you should try some spelling variations:
cam thuc » nam thuc, cam thu, can thuc
vat hanh » vat thanh, van hanh, va hanh
cau treo » cau theo, cau tren, cau triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
vi cau » va cau, ve cau, di cau
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu qua ((cam thuc) OR (am thuc)) vat hanh vi cau treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu qua ((cam thuc) OR (am thuc)) vat hanh vi cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu qua ((cam thuc) OR (am thuc)) vat hanh vi cau treo*.