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, cau treo
trinh do » trinh ky
sach thu » sach thue, sach thieu, sach tham
va trinh » van trinh, va tinh, lap trinh
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
ca tren » cu tren, la tren, co tren

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