Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, cau phuc
can thuc » dan thuc, van thuc, cay thuc
danh vai » danh sai, danh va, doanh van
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ky dang xa hoi. hieu va ((cau thuc) OR (can thuc)) va danh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky dang xa hoi. hieu va ((cau thuc) OR (can thuc)) va danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: co sach ky dang xa hoi. hieu va ((cau thuc) OR (can thuc)) va danh vai cua tre*.