Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
cham thuc » nham thuc, pham thuc, tham thuc
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
so triet » su triet, so thiet, bo triet
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
y nang » ky nang, ly nang, v 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 xa hoi. ((hieu ve) or (hieu van)) cham thuc vat thanh hai so triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang xa hoi. ((hieu ve) OR (hieu van)) cham thuc vat thanh hai so triet.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang xa hoi. ((hieu ve) or (hieu van)) cham thuc vat thanh hai so triet*.