Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
hang van » hoang van, hang va, tang van
dang van » hoang van, hang va
cau tren » cu tren, dau tren, ca tren
sinh yu » sinh y, sinh tu, tinh yeu
hieu ve » hieu va, hieu van
luc gia » luoc gia, quoc gia, duc giao
duc gia » quoc gia
doi cau » doi dau, di cau, doi ca
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh yu ((hang van) OR (dang van)) hoi. hieu ve cau ((luc gia) or (duc gia)) thanh doi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh yu ((hang van) OR (dang van)) hoi. hieu ve cau ((luc gia) OR (duc gia)) thanh doi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh yu ((hang van) OR (dang van)) hoi. hieu ve cau ((luc gia) or (duc gia)) thanh doi cau tren".
• Adding a wildcard symbol may retrieve word variants: hoc sinh yu ((hang van) OR (dang van)) hoi. hieu ve cau ((luc gia) or (duc gia)) thanh doi cau tren*.