Perhaps you should try some spelling variations:
hieu van » thien van, lieu va
cam truc » cau truc, nam truc, lam truoc
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
su dai » sau dai, si dai, su tai
dai ky » dan ky, dai ly, sai ky
x hoi » xa hoi, o hoi, x ho
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su dai ky nang x hoi. ((((hieu ve) OR (hieu van))) or (hieu va)) cam truc van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dai ky nang x hoi. ((((hieu ve) OR (hieu van))) OR (hieu va)) cam truc van hanh vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su dai ky nang x hoi. ((((hieu ve) OR (hieu van))) or (hieu va)) cam truc van hanh vi su triet*".