Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
dau thuc » dan thuc, dai thuc, dam thuc
thuc van » thuc vat, thuc dan, thuc va
cau tren » cu tren, dau tren, ca tren
ly nang » ky nang, ly hang, ly vang
hanh ve » hanh va, hanh kem
y nang » ky nang, v nang, may nang
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ((y nang) or (ly nang)) xa hoi. lieu va dau thuc van ((hanh ve) OR (hanh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ((y nang) OR (ly nang)) xa hoi. lieu va dau thuc van ((hanh ve) OR (hanh vi)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ((y nang) or (ly nang)) xa hoi. lieu va dau thuc van ((hanh ve) OR (hanh vi)) cau tren".
• Adding a wildcard symbol may retrieve word variants: vu khach ((y nang) or (ly nang)) xa hoi. lieu va dau thuc van ((hanh ve) OR (hanh vi)) cau tren*.