Perhaps you should try some spelling variations:
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
cach tu » cach thuc
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cu tren » tu tren, dua tren
cac tu » cac thu, cac du, tac tu
sac ky » cac ky, sai ky
vi cu » vi su, vi xu, vi du

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) lang xa hoi. hieu va ((cac tu) or (cach tu)) va dinh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) lang xa hoi. hieu va ((cac tu) OR (cach tu)) va dinh vi cu tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) lang xa hoi. hieu va ((cac tu) or (cach tu)) va dinh vi cu tren*.