Perhaps you should try some spelling variations:
hieu hieu » hien hieu, hieu hien, thien hieu
hieu cac » hieu luc, hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
tinh va » tich va, trinh van, trinh vat
dinh va » dinh van, dinh ve, sinh va
cac lao » ca lao, cac loai, cac giao
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sac ky » cac ky, sai ky
lao va » tao va, cao va, bao va
su sac » su sach, su cac, su xac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (lang xa)) hoi. hieu hieu cac lao va ((dinh va) OR (tinh va)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang xa) OR (lang xa)) hoi. hieu hieu cac lao va ((dinh va) or (tinh va)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) OR (lang xa)) hoi. hieu hieu cac lao va ((dinh va) or (tinh va)) cuu tre*.