Perhaps you should try some spelling variations:
phan dang » phan dau, phan cong, nhan dan
luc phan » duc phan, luc nhan, luan phan
cau luc » cau truc, cau phuc
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hieu le » hieu ve, hieu he, hieu ly
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
va cau » van cau, va cac, va cao
va dau » va dao
le cau » ke cau, le mau, le cap

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 ty ((nang xa) or (lang xa)) hoi. hieu le cau luc phan dang ((va cau) or (va dau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (lang xa)) hoi. hieu le cau luc phan dang ((va cau) OR (va dau)) tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (lang xa)) hoi. hieu le cau luc phan dang ((va cau) or (va dau)) tren*.