Perhaps you should try some spelling variations:
tang van » dang van, hoang van, trong van
va tich » va tinh, va dich
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
chu tre » cho tre, chu tri, cuu tre
va nam » van nam, ha nam, va nay
thu va » thuc va, thue va, tu va
va chu » va che, 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 (nang ma))) or (tang van)) hoi. hieu va nam thu va tich va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((((nang xa) OR (nang ma))) OR (tang van)) hoi. hieu va nam thu va tich va chu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((((nang xa) OR (nang ma))) or (tang van)) hoi. hieu va nam thu va tich va chu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((((nang xa) OR (nang ma))) or (tang van)) hoi. hieu va nam thu va tich va chu tre*.