Perhaps you should try some spelling variations:
trinh vi » trinh va, trinh ve, trinh viet
binh voi » binh hoi, minh voi, tinh voi
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) OR (sac ky)) nang xa hoi. hieu va cac luc va ((trinh vi) or (binh voi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sac ky)) nang xa hoi. hieu va cac luc va ((trinh vi) OR (binh voi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sac ky)) nang xa hoi. hieu va cac luc va ((trinh vi) or (binh voi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) OR (sac ky)) nang xa hoi. hieu va cac luc va ((trinh vi) or (binh voi)) cua tre*.