Perhaps you should try some spelling variations:
thanh moi » thanh loi, thanh hoa, thanh hai
ve triet » va trien, su triet
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
cac luc » cau luc, cac nuoc, cac cuoc
su dai » sau dai, si dai, su tai
su hai » su tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su hai) or (su dai)) ky tang xa hoi. hieu van ((cac luc) OR (coc luc)) va thanh moi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su hai) OR (su dai)) ky tang xa hoi. hieu van ((cac luc) OR (coc luc)) va thanh moi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su hai) or (su dai)) ky tang xa hoi. hieu van ((cac luc) OR (coc luc)) va thanh moi ve triet".
• Adding a wildcard symbol may retrieve word variants: ((su hai) or (su dai)) ky tang xa hoi. hieu van ((cac luc) OR (coc luc)) va thanh moi ve triet*.