Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
va thanh » gia thanh, va tinh, le thanh
te sach » toc sach
nang xa » nang x, lang xa, nang ma
cac duc » cac du, cao duc, cac dac
cua tre » cuu tre, cua triet, dua tren
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: te sach thu nang xa hoi. lieu va cac duc ((va thanh) or (ban thanh)) dai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang xa hoi. lieu va cac duc ((va thanh) OR (ban thanh)) dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang xa hoi. lieu va cac duc ((va thanh) or (ban thanh)) dai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang xa hoi. lieu va cac duc ((va thanh) or (ban thanh)) dai ((cua tre) OR (cua te))*.