Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, thuoc sach
tru nang » tra nang, tri nang, thi nang
xa thanh » va thanh, ha thanh, ta thanh
va triet » va thiet, va trien, ve triet
tu nang » tu nong, tu nano, tu lang
cac tac » cac toc, cac bac, cac dac
tac xa » tuc xa, tac da
tai va » thai va, mai va, tri va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((tu nang) or (((tru nang) OR (truc nano)))) xa hoi. lieu va cac tac xa thanh tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((tu nang) OR (((tru nang) OR (truc nano)))) xa hoi. lieu va cac tac xa thanh tai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((tu nang) or (((tru nang) OR (truc nano)))) xa hoi. lieu va cac tac xa thanh tai va triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ((tu nang) or (((tru nang) OR (truc nano)))) xa hoi. lieu va cac tac xa thanh tai va triet*.