Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
van thanh » ban thanh, van tuan
vu khach » vu khanh, vu khac, vay khach
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao
su van » tu van, vu van
x hoi » xa hoi, o hoi, x ho

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: ((su sach) OR (vu khach)) ky nang x hoi. hieu ((ve cao) OR (va cao)) su van thanh dat cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu khach)) ky nang x hoi. hieu ((ve cao) OR (va cao)) su van thanh dat cau tren~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky nang x hoi. hieu ((ve cao) OR (va cao)) su van thanh dat cau tren*.