Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
ban thai » ban thi, ban tai, ban thoi
ban than » ban thanh, van thanh, ban hang
dua tren » dung tren
tu sach » thu sach, su sach, te sach
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu nang x hoi. lieu va cac vuc van ((ban thai) OR (ban than)) ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang x hoi. lieu va cac vuc van ((ban thai) OR (ban than)) ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu nang x hoi. lieu va cac vuc van ((ban thai) OR (ban than)) ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang x hoi. lieu va cac vuc van ((ban thai) OR (ban than)) ((dua tren) or (cua te))*.