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
tinh doi » trinh doc, trinh do, tinh hoc
xanh doi » xanh di, thanh doi, anh doc
cau tren » cu tren, dau tren, ca tren
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
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 ((ty nang) OR (ty hang)) xa hoi. lieu vien sach nuoc va ((xanh doi) or (tinh doi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty hang)) xa hoi. lieu vien sach nuoc va ((xanh doi) OR (tinh doi)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ty hang)) xa hoi. lieu vien sach nuoc va ((xanh doi) or (tinh doi)) cau tren".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) OR (ty hang)) xa hoi. lieu vien sach nuoc va ((xanh doi) or (tinh doi)) cau tren*.