Perhaps you should try some spelling variations:
nang doc » nang luc
so sach » so sanh, bo sach, co sach
hai chi » thai chi, tai chi, hai thi
hai chu » hai chau, hoi chu, hai phu
va hang » van hang, va nang, va lang
van hac » van hoc, van ha, van hai
van bac » van ban, van bao, dan bac
doc hoi » duoc hoi, hoc hoi, doc hai
sach v » sach va, sach y, sach 2
xuc va » duc va, tuc va, luc va
v nang » va nang, vu nang, van 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 doc hoi. thien ((van bac) or (van hac)) xuc va hang ((hai chu) OR (hai chi)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang doc hoi. thien ((van bac) OR (van hac)) xuc va hang ((hai chu) OR (hai chi)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v nang doc hoi. thien ((van bac) or (van hac)) xuc va hang ((hai chu) OR (hai chi)) tre*".