Perhaps you should try some spelling variations:
dang xay » dang van, van xay
thanh vi » hanh vi, thanh va, thanh ve
sach ky » sach y, sach ty, sach kem
luc gia » luoc gia, duc gia, quoc gia
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
vi cua » vai cua, di cua

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

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