Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van chat » cao chat
tang xa » trang xa, tang ma, lang xa
dinh ve » dinh ket, dinh van
luu tre » luu tru, cuu tre, luy tre
y tang » ky tang, 6 tang, 7 tang
luc va » tuc va, loc va
ve luu » ke luu, vi luu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y tang xa hoi. hieu van chat ((luc va) or (duc va)) dinh ve luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y tang xa hoi. hieu van chat ((luc va) OR (duc va)) dinh ve luu tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y tang xa hoi. hieu van chat ((luc va) or (duc va)) dinh ve luu tre*.