Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
cam thuc » am thuc, nam thuc, cam thu
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
vat han » vat phan, van han, vat ran
han lai » han tai, han li, phan loai
te van » le van, te va, ve van

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

• Performing a fuzzy search may retrieve terms with similar spellings: te van ky nang xa hoi. ((hieu van) OR (hieu va)) cam thuc vat han lai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te van ky nang xa hoi. ((hieu van) OR (hieu va)) cam thuc vat han lai su triet".
• Adding a wildcard symbol may retrieve word variants: te van ky nang xa hoi. ((hieu van) OR (hieu va)) cam thuc vat han lai su triet*.