Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
va cham » va chat, va tham
hoc ban » hoc bang, hoc dan, hoc bai
ve cham » ve chat, vu cham, ve chim
ky dang » ky nang, ky danh
hai va » hai van, thai va, hoi va
thiet » thieu

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 ((ky dang) or (ty xang)) xa hoi. hieu ((ve cham) or (va cham)) hoc ban thanh hai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky dang) OR (ty xang)) xa hoi. hieu ((ve cham) OR (va cham)) hoc ban thanh hai va thiet.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky dang) or (ty xang)) xa hoi. hieu ((ve cham) or (va cham)) hoc ban thanh hai va thiet*.