Perhaps you should try some spelling variations:
thanh nghia » thanh nghi, thanh nga, thanh nha
cau treo » cau theo, cau tren, cau triet
cam thuc » am thuc, cam thu, can thuc
da thanh » dao thanh, dat thanh, dam thanh
nam thuc » nam thuoc, am thuc, nam thu
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren
su sach » so sach, vu sach
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang x hoi. hieu ve ((cam thuc) or (nam thuc)) da thanh nghia ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu ve ((cam thuc) OR (nam thuc)) da thanh nghia ((cuu tre) OR (cau treo))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x hoi. hieu ve ((cam thuc) or (nam thuc)) da thanh nghia ((cuu tre) OR (cau treo))*".