Perhaps you should try some spelling variations:
hanh dam » thanh dam, hanh lam, hanh nam
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
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 ((thi hanh) or (thi thanh)) xa hoi. hieu ve cac tuc va hanh dam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thi hanh) OR (thi thanh)) xa hoi. hieu ve cac tuc va hanh dam va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((thi hanh) or (thi thanh)) xa hoi. hieu ve cac tuc va hanh dam va triet*.