Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
dinh vu » dich vu, dinh ve, dinh cu
xuc ban » duc ban, cuc ban, quoc ban
xuc van » duc van, luc van, thuc van
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ty nang » ky nang, ty hang, ly nang
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho
vu va » vu van, tu va, su va

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) or (ty xang)) x hoi. hieu ve cam ((xuc van) OR (xuc ban)) dinh vu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) x hoi. hieu ve cam ((xuc van) OR (xuc ban)) dinh vu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty xang)) x hoi. hieu ve cam ((xuc van) OR (xuc ban)) dinh vu va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) x hoi. hieu ve cam ((xuc van) OR (xuc ban)) dinh vu va triet*.