Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cam quoc » cac quoc, cao quoc, nam quoc
chuc tre » thuc tre, chuc theo, thuc te
banh hoi » binh hoi, hanh thoi, benh hoc
ban banh » ban hanh, ban anh, ban danh
quoc ban » quoc bao, quoc lan, quoc quan
thuoc ho » thuoc bo, thuoc ma, thuoc va
hieu va » lieu va, hieu qua
ty lang » tay lang, ty hang, tu lang
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ty lang) OR (ty xang)) xa hoi. hieu va cam quoc ban banh hoi ((chuc tre) or (thuoc ho))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty lang) OR (ty xang)) xa hoi. hieu va cam quoc ban banh hoi ((chuc tre) OR (thuoc ho)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty lang) OR (ty xang)) xa hoi. hieu va cam quoc ban banh hoi ((chuc tre) or (thuoc ho))".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty lang) OR (ty xang)) xa hoi. hieu va cam quoc ban banh hoi ((chuc tre) or (thuoc ho))*.