Perhaps you should try some spelling variations:
hieu van » thien van, hieu ve
cam truc » cau truc, nam truc, lam truoc
phan tai » pham tai, nhan tai, phan thi
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
truc va » thuc va, thuc vat, trung va
va phan » van phan, va phat, va phap
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
tai su » tai so, tai tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky nang xa hoi. ((((hieu van) OR (hieu va))) or (lieu va)) cam truc va phan tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky nang xa hoi. ((((hieu van) OR (hieu va))) OR (lieu va)) cam truc va phan tai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky nang xa hoi. ((((hieu van) OR (hieu va))) or (lieu va)) cam truc va phan tai su triet".
• Adding a wildcard symbol may retrieve word variants: te san ky nang xa hoi. ((((hieu van) OR (hieu va))) or (lieu va)) cam truc va phan tai su triet*.