Perhaps you should try some spelling variations:
dang xay » dang van, van xay
va lanh » va lang, va danh, va hanh
cam tuc » cam tu, nam thuc, dam thuc
hieu va » lieu va, hieu qua
dao hoa » dao hoan, do hoa, dao ho
lang xa » lang ha, lang van
sai ky » sac ky
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 ((lang xa) or (dang xay)) hoi. hieu va ((cam tuc) OR (cam xuc)) va lanh dao hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((lang xa) OR (dang xay)) hoi. hieu va ((cam tuc) OR (cam xuc)) va lanh dao hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((lang xa) or (dang xay)) hoi. hieu va ((cam tuc) OR (cam xuc)) va lanh dao hoa viet".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((lang xa) or (dang xay)) hoi. hieu va ((cam tuc) OR (cam xuc)) va lanh dao hoa viet*.