Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
lieu van » hieu van, sieu van, lieu nano
thuc van » thuc vat, thuc va, thuc hanh
thuc dan » thuc hanh, hoc dan, thuc vat
cau tren » cu tren, dau tren, ca tren
y nang » ky nang, ly nang, v nang
vi cau » va cau, ve cau, di 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 khach y nang x hoi. ((lieu van) or (lieu va)) can ((thuc van) OR (thuc dan)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach y nang x hoi. ((lieu van) OR (lieu va)) can ((thuc van) OR (thuc dan)) hanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach y nang x hoi. ((lieu van) or (lieu va)) can ((thuc van) OR (thuc dan)) hanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: vu khach y nang x hoi. ((lieu van) or (lieu va)) can ((thuc van) OR (thuc dan)) hanh vi cau tren*.