Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
van nang » van quang, van ban, van dong
so sach » so sanh, bo sach, co sach
van hac » van hoc, van ha, van hai
hai chu » hai chau, hoi chu, hai chi
va hang » van hang, va nang, va lang
van bac » van ban, van bao, dan bac
chu tre » cho tre, chu tri, cuu tre
doc hai » hoc hai, duc hai, do hai
xuc va » duc va, tuc va, luc va
v nang » va nang, vu nang, voi nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((v nang) OR (van nang)) doc hai. thien ((van bac) or (van hac)) xuc va hang hai chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((v nang) OR (van nang)) doc hai. thien ((van bac) OR (van hac)) xuc va hang hai chu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((v nang) OR (van nang)) doc hai. thien ((van bac) or (van hac)) xuc va hang hai chu tre*".