Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
tham luc » than luc, tham nuoc, tham thuc
lieu van » lieu va, hieu van, sieu van
van tham » van thanh, van tuan, van chat
van nang » van quang, van ban, van dong
vu nang » vuc nang, va nang, vu dang
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
cua tre » cuu tre, cua triet, dua tren
luc va » duc va, tuc va, loc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((vu nang) or (van nang)) xa hoi. lieu van tham luc va hang di ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((vu nang) OR (van nang)) xa hoi. lieu van tham luc va hang di ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((vu nang) or (van nang)) xa hoi. lieu van tham luc va hang di ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((vu nang) or (van nang)) xa hoi. lieu van tham luc va hang di ((cua tre) OR (cua te))*.