Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
hanh tai » hang tai, han tai, hinh tai
tuc van » thuc van, truc van, tuc va
cac tuc » cac toc, cac tu, cac tac
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
xay hoi » xa hoi, tay hoi, cay phoi
anh xay » manh xay, anh hay, nganh xay
ky anh » ky danh, ly anh, ty anh

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky anh xay hoi. ((hieu ve) OR (hieu van)) cac tuc van ((hanh tai) or (thanh tai)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky anh xay hoi. ((hieu ve) OR (hieu van)) cac tuc van ((hanh tai) OR (thanh tai)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky anh xay hoi. ((hieu ve) OR (hieu van)) cac tuc van ((hanh tai) or (thanh tai)) va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky anh xay hoi. ((hieu ve) OR (hieu van)) cac tuc van ((hanh tai) or (thanh tai)) va triet*.