Perhaps you should try some spelling variations:
va nhanh » va thanh, va hanh, va nhan
nhanh ha » thanh hoa, thanh hai, khanh hoa
pha viet » phap viet, pham viet, phan viet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
va cam » va cham, va cao, va cai
ha pha » kham pha, hoa phan, khai pha

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

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