Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
ve triet » va trien, su triet
hieu ve » hieu va, hieu van
hanh va » hang va
bac so » bac son, bac si, bac bo
so van » su van, vo van
ve bac » ve bao, ve cac, ve ban
x hoi » xa hoi, o hoi, x ho

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