Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
so triet » su triet, so thiet, bo triet
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va
thuc va » thuc vat, thuc dan, thuc day
y nang » ly nang, v nang, may nang
hai so » dai so, tai so, thai son

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 (ky nang)) xa hoi. ((hieu ve) or (hieu van)) cham thuc va thanh hai so triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((y nang) OR (ky nang)) xa hoi. ((hieu ve) OR (hieu van)) cham thuc va thanh hai so triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((y nang) OR (ky nang)) xa hoi. ((hieu ve) or (hieu van)) cham thuc va thanh hai so triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((y nang) OR (ky nang)) xa hoi. ((hieu ve) or (hieu van)) cham thuc va thanh hai so triet*.