Perhaps you should try some spelling variations:
danh cong » dang cong, hanh cong, anh cong
cong cua » cong cu, dong cua, huong cua
cua cau » cua cac, cua chu, cua cay
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
ve cac » va cac, vien cac
sai ky » sac ky
luc va » duc va, tuc va
loc va » hoc va
tu sai » tu bai, tu san, tu cai

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

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