Perhaps you should try some spelling variations:
tang van » dang van, hoang van, trong van
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va tich » va tinh, va dich
va nam » van nam, ha nam, va nay
thu va » thuc va, thue va, tu va
va chu » va cau, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (tang van)) hoi. hieu va nam thu va tich ((va chu) OR (va che)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (tang van)) hoi. hieu va nam thu va tich ((va chu) OR (va che)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (tang van)) hoi. hieu va nam thu va tich ((va chu) OR (va che)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (tang van)) hoi. hieu va nam thu va tich ((va chu) OR (va che)) tre*.