Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
cam quoc » cac quoc, cao quoc, nam quoc
chau tho » chat thom, cau thi, phu tho
hang lai » hang tai, hang hai, hang loi
ban hang » ngan hang
quoc ban » quoc bao, quoc lan, quoc quan
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
y nang » ky nang, ly nang, v nang
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 y nang x hoi. ((hieu ve) OR (hieu van)) cam quoc ban hang lai ((chau tho) or (chay tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((hieu ve) OR (hieu van)) cam quoc ban hang lai ((chau tho) OR (chay tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu ve) OR (hieu van)) cam quoc ban hang lai ((chau tho) or (chay tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu ve) OR (hieu van)) cam quoc ban hang lai ((chau tho) or (chay tren))*.