Perhaps you should try some spelling variations:
phan dang » phan dau, phan cong, nhan dan
luan phan » luan van, luan hoan
cac luan » cac luat, sach luan, cac dan
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
tu nang » tru nang, tu nong, tu lang
tu nano » truc nano
hieu ve » hieu va, hieu van
dang va » dang van, dang vat, hang va
ve cac » va cac, vien cac
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: te sach ((tu nang) OR (tu nano)) xa hoi. hieu ve cac luan phan dang va cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) OR (tu nano)) xa hoi. hieu ve cac luan phan dang va cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) OR (tu nano)) xa hoi. hieu ve cac luan phan dang va cau tren*.