Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
danh cong » dang cong, hanh cong, anh cong
hieu viec » nhieu viec, hieu ve, sieu viet
cong cua » cong cu, dong cua, huong cua
cac luc » cau luc, coc luc, cac nuoc
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
va danh » va dinh, va dan, va hanh
tu sai » tu bai, tu san, tu cai
luc va » duc va, tuc va, loc va
sai ky » sac ky
cua cu » cua chu, cua cau, cua su

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