Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dan cong » dang cong, van cong, dan dong
cong cua » cong cu, dong cua, huong cua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
hieu va » lieu va, hieu qua
tu sai » tu san, tu cai, tu lai
tu bai » tu ban, tu bat, te bai
va dan » ca dan, va dao, va dau
cua su » qua 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) or (tu bai)) ky ((nang xa) OR (lang xa)) hoi. hieu va cac nuoc va dan cong cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sai) OR (tu bai)) ky ((nang xa) OR (lang xa)) hoi. hieu va cac nuoc va dan cong cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sai) or (tu bai)) ky ((nang xa) OR (lang xa)) hoi. hieu va cac nuoc va dan cong cua su".
• Adding a wildcard symbol may retrieve word variants: ((tu sai) or (tu bai)) ky ((nang xa) OR (lang xa)) hoi. hieu va cac nuoc va dan cong cua su*.