Perhaps you should try some spelling variations:
cach thuc » anh thuc
hieu van » hieu va, thien van, lieu va
danh lai » danh sai, gianh lai, dinh lam
va danh » va dinh, va dan, va hanh
cam duc » cao duc, pham duc, nam duoc
nang ma » tang ma, sang ma, nang cao
cac thu » cac thoi
ma hoi » mai hoi, xa hoi, ma hoa
lai va » loai va, mai va, dai va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((cach thuc) or (cac thu)) nang ma hoi. hieu van ((cam duc) or (cam xuc)) va danh lai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((cach thuc) OR (cac thu)) nang ma hoi. hieu van ((cam duc) OR (cam xuc)) va danh lai va thiet.
• Adding a wildcard symbol may retrieve word variants: su ((cach thuc) or (cac thu)) nang ma hoi. hieu van ((cam duc) or (cam xuc)) va danh lai va thiet*.