Perhaps you should try some spelling variations:
vu triet » su triet, ve triet, va triet
hang lap » sang lap, hang la, hang tap
ban hang » ngan hang
xuc ban » duc ban, cuc ban, quoc ban
vien da » vien dai, hien dai
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
lap vu » lap va, lap du, lap tu
ve cam » ve cham, ve cac, va cam
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

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