Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
luoc van » luoc can, luoc va, luot van
dang xay » dang van, van xay
van cam » van nam, van lam, van cau
hanh di » hanh vi, hanh de, hang di
luc van » luu van, duc van, luc va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, mang cua
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 ((mang xa) or (dang xay)) hoi. hieu van cam ((luc van) or (luoc van)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((mang xa) OR (dang xay)) hoi. hieu van cam ((luc van) OR (luoc van)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang xa) or (dang xay)) hoi. hieu van cam ((luc van) or (luoc van)) hanh di cua tre*.