Perhaps you should try some spelling variations:
dua tren » dung tren
ngay doc » ngay do, ngay moi, ngay de
dinh tri » chinh tri
va dinh » van dinh, va kinh, va tinh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
te sai » te tai, te bai, te lai
sai ky » sac ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky nang xa hoi. hieu va ((nay duc) OR (ngay doc)) va dinh tri ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky nang xa hoi. hieu va ((nay duc) OR (ngay doc)) va dinh tri ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky nang xa hoi. hieu va ((nay duc) OR (ngay doc)) va dinh tri ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sai ky nang xa hoi. hieu va ((nay duc) OR (ngay doc)) va dinh tri ((dua tren) or (cua te))*.