Perhaps you should try some spelling variations:
thien van » thi van
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
tinh via » tinh gia, tinh va, tinh vi
via cua » gia cua, gian cua, giau cua
te sach » toc sach
hieu ve » hieu va, hieu van
luc va » tuc va, loc va
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 thu nang x hoi. ((hieu ve) or (thien van)) cam ((luc va) OR (duc va)) tinh via cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang x hoi. ((hieu ve) OR (thien van)) cam ((luc va) OR (duc va)) tinh via cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang x hoi. ((hieu ve) or (thien van)) cam ((luc va) OR (duc va)) tinh via cua te*".