Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
day van » day va, dao van, duy van
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
dao va » dao van, tao va, do va

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 ((ky tang) or (ky dang)) van hoi. ((hieu ve) or (hieu van)) nham thuc day van dao va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ky tang) OR (ky dang)) van hoi. ((hieu ve) OR (hieu van)) nham thuc day van dao va triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky tang) or (ky dang)) van hoi. ((hieu ve) or (hieu van)) nham thuc day van dao va triet*.