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

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) OR (hoc sach)) 2 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: ((co sach) OR (hoc sach)) 2 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: "((co sach) OR (hoc sach)) 2 nang doc hai. thien ((van bac) or (van hac)) xuc va hang hai chu tre*".