Perhaps you should try some spelling variations:
thu nang » thi nang, thu hang, thu bang
sach thu » sach thue, sach thieu, sach tham
te sach » toc sach
va danh » va dinh, va hanh, dia danh
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cac tu » cac thu, cach tu, cac du
va dan » ca dan, va dao, va dau
di cuu » di cau, dinh cuu
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: te sach thu nang xa hoi. hieu va cac tu ((va danh) or (va dan)) ((di cuu) OR (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang xa hoi. hieu va cac tu ((va danh) OR (va dan)) ((di cuu) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang xa hoi. hieu va cac tu ((va danh) or (va dan)) ((di cuu) OR (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang xa hoi. hieu va cac tu ((va danh) or (va dan)) ((di cuu) OR (di cua)) tre*.