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
cau tren » cu tren, dau tren, ca tren
hanh doi » thanh doi, hanh noi, hang doi
lang van » dang van, tang van, hoang van
doi cau » doi dau, di cau, doi ca
va hanh » van hanh, va thanh, ban hanh
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ((nang x) or (((lang xa) OR (lang van)))) hoi. lieu vien sach nuoc va hanh doi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang x) OR (((lang xa) OR (lang van)))) hoi. lieu vien sach nuoc va hanh doi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((nang x) or (((lang xa) OR (lang van)))) hoi. lieu vien sach nuoc va hanh doi cau tren".
• Adding a wildcard symbol may retrieve word variants: so sach ty ((nang x) or (((lang xa) OR (lang van)))) hoi. lieu vien sach nuoc va hanh doi cau tren*.