Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
can thuc » dan thuc, van thuc, cay thuc
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
vu sach » vu bach, vu khach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach
van can » van canh, van ban, ban can

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) or (su sach)) ky lang xa hoi. hieu van can thuc va hanh vi ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky lang xa hoi. hieu van can thuc va hanh vi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (su sach)) ky lang xa hoi. hieu van can thuc va hanh vi ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky lang xa hoi. hieu van can thuc va hanh vi ((cuu tre) OR (cau treo))*.