Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tra nang » thi nang, kha nang, da nang
van chat » cao chat
sach tra » sach tranh, sach tham, sach tren
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau treo
dau dai » dat dai, sau dai, dau da
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va dau » va dao
va co » vo co

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tra nang xa hoi. hieu ((van chat) OR (va co)) thuc va dau dai ((cuu tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tra nang xa hoi. hieu ((van chat) or (va co)) thuc va dau dai ((cuu tre) OR (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sach tra nang xa hoi. hieu ((van chat) or (va co)) thuc va dau dai ((cuu tre) OR (cau tren))*.