Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
te sach » toc sach
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
ve cua » le cua, de cua, te cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty xang) or (ky nang)) xa hoi. ((hieu ve) or (lieu va)) cau thuc va hanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty xang) OR (ky nang)) xa hoi. ((hieu ve) OR (lieu va)) cau thuc va hanh ve cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ((ty xang) or (ky nang)) xa hoi. ((hieu ve) or (lieu va)) cau thuc va hanh ve cua te*.