Perhaps you should try some spelling variations:
viet sach » viet anh, dien sach, viet tech
sieu viet » su viet, dien viet, bien viet
sach nuoc » sach duoc, cac nuoc, bach tuoc
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
va xanh » va hanh, va anh, va banh
va danh » va dinh, va dan, va hanh
doi cau » doi dau, di cau, doi ca
su cac » su cao, su can, eu cac

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

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