Perhaps you should try some spelling variations:
vien sach » vien bach, dien sach, viet sach
sach nuoc » sach duoc, cac nuoc, bach tuoc
lieu vien » lieu dien, lieu viet, dieu kien
diem cau » dieu can
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
va xanh » va hanh, va danh, va anh
nang xa » nang x, nang ma, mang xa
su sach » so sach, vu sach
di cau » da cau

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 ky ((nang xa) or (lang xa)) hoi. lieu vien sach nuoc va xanh ((di cau) OR (diem cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. lieu vien sach nuoc va xanh ((di cau) OR (diem cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (lang xa)) hoi. lieu vien sach nuoc va xanh ((di cau) OR (diem cau)) tren".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang xa)) hoi. lieu vien sach nuoc va xanh ((di cau) OR (diem cau)) tren*.