Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh van
thanh hai » thanh phan, thanh hoa, thanh san
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
van bac » van ban, van bao, van hac
y nang » ky nang, ly nang, v nang
o hoi » co hoi, o hoc, o hai

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 y nang ((xa hoi) or (o hoi)). hieu van bac duc va ((thanh lap) or (thanh hai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((xa hoi) OR (o hoi)). hieu van bac duc va ((thanh lap) OR (thanh hai)) su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((xa hoi) or (o hoi)). hieu van bac duc va ((thanh lap) or (thanh hai)) su triet*.