Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam truc » cau truc, nam truc, lam truoc
nam thuc » nam thuoc, am thuc, nam tu
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
han lai » han tai, han li, phan loai
te van » le van, te va, ve van
ma hoi » mai hoi, xa hoi, ma hoa
va han » va phan, van han, va hanh

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 ma hoi. hieu van ((cam truc) or (((nam thuc) OR (nam thu)))) va han lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te van ky nang ma hoi. hieu van ((cam truc) OR (((nam thuc) OR (nam thu)))) va han lai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te van ky nang ma hoi. hieu van ((cam truc) or (((nam thuc) OR (nam thu)))) va han lai su triet".
• Adding a wildcard symbol may retrieve word variants: te van ky nang ma hoi. hieu van ((cam truc) or (((nam thuc) OR (nam thu)))) va han lai su triet*.