Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
tham luc » than luc, tham nuoc, tham thuc
co sach » bo sach, cuon sach, hoc sach
vu nang » vuc nang, vu dang, v nang
va nang » van nang, da nang, cam nang
va hang » van hang, va lang, va hanh
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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 ((vu nang) OR (va nang)) xa hoi. hieu van tham luc va hang di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ((vu nang) OR (va nang)) xa hoi. hieu van tham luc va hang di cua tre".
• Adding a wildcard symbol may retrieve word variants: co sach ((vu nang) OR (va nang)) xa hoi. hieu van tham luc va hang di cua tre*.