Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cau thuc » cau truc, cuu thuc, cau phuc
can thuc » dan thuc, van thuc, cay thuc
hanh dai » hanh tai, hanh dao, vanh dai
dang ha » dong ha, dung ha, lang ha
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ dang
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y dang ha hoi. hieu ve ((cau thuc) OR (can thuc)) va hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y dang ha hoi. hieu ve ((cau thuc) OR (can thuc)) va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach y dang ha hoi. hieu ve ((cau thuc) OR (can thuc)) va hanh dai cua tre*.