Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
bien nien » dien bien
dieu hien » dieu khien, dieu kien, bieu hien
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
su sach » so sach, vu sach
du cua » duy cua, dau cua, dum cua

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 ky nang xa hoi. ((bien nien) or (dieu hien)) bach tuoc ((va danh) OR (va hanh)) du cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((bien nien) OR (dieu hien)) bach tuoc ((va danh) OR (va hanh)) du cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((bien nien) or (dieu hien)) bach tuoc ((va danh) OR (va hanh)) du cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((bien nien) or (dieu hien)) bach tuoc ((va danh) OR (va hanh)) du cua viet*.