Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve bac » ve bao, ve cac, ve ban
bo ban » co ban, lo ban, do ban
x hoi » o hoi, x ho
5 hoi » o hoi
vi su » va su, ve su, ki su

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 ky nang ((((x hoi) OR (5 hoi))) or (xa hoi)). hieu ve bac bo ban hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((((x hoi) OR (5 hoi))) OR (xa hoi)). hieu ve bac bo ban hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((((x hoi) OR (5 hoi))) or (xa hoi)). hieu ve bac bo ban hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((((x hoi) OR (5 hoi))) or (xa hoi)). hieu ve bac bo ban hanh vi su triet*.