Perhaps you should try some spelling variations:
cach danh » sach danh, cach nhanh, cac dan
thuc cach » thuoc sach, truoc cach, thuc hanh
nang mai » nang ma, nang tai, lang mai
hieu van » thien van, hieu ve
cau thuc » cau truc, cuu thuc, can thuc
so hanh » so sanh, so danh, co hanh
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » hieu qua
hanh ky » hanh kem
danh di » danh du, xanh di, danh dien
di cua » dai cua, doi cua, de 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: so hanh ky nang mai hoi. ((((hieu van) OR (hieu va))) or (lieu va)) cau thuc cach danh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so hanh ky nang mai hoi. ((((hieu van) OR (hieu va))) OR (lieu va)) cau thuc cach danh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so hanh ky nang mai hoi. ((((hieu van) OR (hieu va))) or (lieu va)) cau thuc cach danh di cua te".
• Adding a wildcard symbol may retrieve word variants: so hanh ky nang mai hoi. ((((hieu van) OR (hieu va))) or (lieu va)) cau thuc cach danh di cua te*.