Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
quoc ban » quoc bao, quoc lan, quoc quan
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
xuc ban » duc ban, cuc ban, xuat ban
vu sach » vu bach, su sach, vu khach
vai va » mai va, dai va, hai va
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (vu sach)) ky nang xa hoi. hieu ve cac ((xuc ban) or (quoc ban)) hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (vu sach)) ky nang xa hoi. hieu ve cac ((xuc ban) OR (quoc ban)) hanh vai va triet.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (vu sach)) ky nang xa hoi. hieu ve cac ((xuc ban) or (quoc ban)) hanh vai va triet*.