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

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 ((cau tren) OR (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 ((cau tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((y nang) or (ly nang)) xa hoi. lieu va cau thuc van hanh di ((cau tren) OR (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 ((cau tren) OR (ca tren))*.