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
y nang » ky nang, ly nang, v nang
va cau » van cau, va cac, va dau
vi cau » di cau, viet cau
ve cau » ke cau, ve cac, le 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: vu sach y nang x hoi. lieu va cau thuc van hanh ((vi cau) or (ve cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang x hoi. lieu va cau thuc van hanh ((vi cau) OR (ve cau)) tren.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang x hoi. lieu va cau thuc van hanh ((vi cau) or (ve cau)) tren*.