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
xanh doi » thanh doi, tinh doi, anh doc
cau tren » cu tren, dau tren, ca tren
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, mang xa
xanh di » danh di, vanh dai, xanh tai
su sach » so sach, vu sach

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