Perhaps you should try some spelling variations:
tang van » dang van, hoang van, trong van
cac thuc » cach thuc, cac thu, cay thuc
can thuc » dan thuc, van thuc, cay thuc
te sach » toc sach
hieu ve » hieu va, hieu van
dan van » dang van, doan van, dao van
y tang » ky tang, 6 tang, 7 tang
van da » van dao, van dau, van dan
da cua » dai cua, day cua, dan cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y tang van hoa. hieu ve ((cac thuc) OR (can thuc)) dan van da cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y tang van hoa. hieu ve ((cac thuc) OR (can thuc)) dan van da cua te".
• Adding a wildcard symbol may retrieve word variants: te sach y tang van hoa. hieu ve ((cac thuc) OR (can thuc)) dan van da cua te*.