Perhaps you should try some spelling variations:
vien sach » vien bach, dien sach, viet sach
lieu vien » lieu dien, lieu viet, dieu kien
sach nuoc » sach duoc, cac nuoc, bach tuoc
ban hanh » ban hang
cau tren » cu tren, dau tren, ca tren
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh
loi cau » loi ca, hoi cau, loi can

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