Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
lap cau » luat cau, phap cau
dan lap » phan lap, dan luan
truc va » thuc va, thuc vat, trung va
ve chat » va chat, van chat
su sach » so sach, vu sach
ve cham » va cham, vu cham, ve chim
va dan » ca dan, va dao, va dau
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thu nang ((x hoi) OR (xa hoi)). hieu ((ve cham) or (ve chat)) truc va dan lap cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang ((x hoi) OR (xa hoi)). hieu ((ve cham) OR (ve chat)) truc va dan lap cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang ((x hoi) OR (xa hoi)). hieu ((ve cham) or (ve chat)) truc va dan lap cau tren".
• Adding a wildcard symbol may retrieve word variants: su sach thu nang ((x hoi) OR (xa hoi)). hieu ((ve cham) or (ve chat)) truc va dan lap cau tren*.