Perhaps you should try some spelling variations:
cach thuc » cac thu
anh thuc » am thuc, dan thuc, anh tu
hanh tai » thanh tai, hang tai, han tai
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
ve cao » va cao, ve bao, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((cach thuc) OR (anh thuc)) ((nang xa) or (tang ma)) hoi. hieu ve cao duc va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cach thuc) OR (anh thuc)) ((nang xa) OR (tang ma)) hoi. hieu ve cao duc va hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((cach thuc) OR (anh thuc)) ((nang xa) or (tang ma)) hoi. hieu ve cao duc va hanh tai cua tre*".