Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh nam » thanh nam, hanh lam, hanh ngay
ve triet » va trien, su 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
nam ve » nam va, nam he, nam v

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 nam ve 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 nam ve 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 nam ve triet*.