Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh dam » thanh dam, hanh lam, hanh nam
thu sach » thuat sach, thuoc sach, thu hoach
thanh xa » thanh ha, thanh va, thanh ba
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
van cau » van dau, van hau, van chat
tuc va » thuc va, truc va, duc va
dam va » dam van, nam va, dam ha

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

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