Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
lieu vien » lieu dien, lieu viet, dieu kien
diem cau » dieu can
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
di cau » da cau

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

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