Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh dam » thanh dam, hanh lam, hanh nam
va triet » va thiet, va trien, ve triet
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
ve cac » va cac, vien cac
tuc va » thuc va, tuc xa, 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: thu sach ((thi hanh) or (thi thanh)) xa hoi. hieu ve cac ((tuc va) OR (truc va)) hanh dam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((thi hanh) OR (thi thanh)) xa hoi. hieu ve cac ((tuc va) OR (truc va)) hanh dam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((thi hanh) or (thi thanh)) xa hoi. hieu ve cac ((tuc va) OR (truc va)) hanh dam va triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((thi hanh) or (thi thanh)) xa hoi. hieu ve cac ((tuc va) OR (truc va)) hanh dam va triet*.