Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
quoc ban » quoc bao, quoc lan, quoc quan
sach ty » sach y, sach tu, sach thu
xuc ban » duc ban, cuc ban, xuat ban
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
kem va » kiem va, kiem van
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: tu sach ty nang x hoi. hieu ((ve cam) or (ve cac)) ((xuc ban) OR (quoc ban)) hanh kem va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu ((ve cam) OR (ve cac)) ((xuc ban) OR (quoc ban)) hanh kem va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu ((ve cam) or (ve cac)) ((xuc ban) OR (quoc ban)) hanh kem va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu ((ve cam) or (ve cac)) ((xuc ban) OR (quoc ban)) hanh kem va triet*.