Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thuc ca » thuc cua, thuc can, thuc cao
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
vai cua » dai cua, hai cua, lai cua
van hoe » van hoa, van hoc, van hieu
dan vai » dan va, dan tai, dan vat
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua te » cua tu
ca dan » cac dan, ca dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (tu sach)) ((ky lang) OR (ky nang)) van hoe. hieu va cham thuc ca dan vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (tu sach)) ((ky lang) OR (ky nang)) van hoe. hieu va cham thuc ca dan vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (tu sach)) ((ky lang) OR (ky nang)) van hoe. hieu va cham thuc ca dan vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (tu sach)) ((ky lang) OR (ky nang)) van hoe. hieu va cham thuc ca dan vai cua te*.