Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
hang hai » hoang hai, thanh hai, hang va
so sach » so sanh, bo sach, co sach
chao vu » chao xu, cao vu, chao chu
ve chao » ve chat, ve cham, ve cho
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
vu van » tu van
o lang » hoa lang, hoi lang

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: so sach ((_ lang) OR (o lang)) xa hoi. hieu ve chao vu van ((hang hai) OR (hang tai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((_ lang) or (o lang)) xa hoi. hieu ve chao vu van ((hang hai) OR (hang tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: so sach ((_ lang) or (o lang)) xa hoi. hieu ve chao vu van ((hang hai) OR (hang tai)) cua tre*.