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

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 ve cau luc phan dang va cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) OR (lang xa)) hoi. hieu ve cau luc phan dang va cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) OR (lang xa)) hoi. hieu ve cau luc phan dang va cau tren*.