Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
ly nang » ky nang, ly hang, ly vang
hanh di » hanh vi, hanh de, hang di
ca tren » cau tren, cu tren, la tren
y nang » ky nang, v nang, may nang
va cau » van cau, va cac, va dau
di ca » di cau, di cua, doi ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((y nang) or (ly nang)) xa hoi. lieu va cau thuc van hanh di ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((y nang) OR (ly nang)) xa hoi. lieu va cau thuc van hanh di ca tren.
• Adding a wildcard symbol may retrieve word variants: vu sach ((y nang) or (ly nang)) xa hoi. lieu va cau thuc van hanh di ca tren*.