Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tru nang » tra nang, tri nang, truc nano
van chat » cao chat
sach tru » sach truc, sach thu, sach tu
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau treo
dao dai » dat dai, dao dan, tao dai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va dao » ca dao
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tru nang xa hoi. hieu ((van chat) or (va co)) thuc va dao dai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tru nang xa hoi. hieu ((van chat) OR (va co)) thuc va dao dai ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tru nang xa hoi. hieu ((van chat) or (va co)) thuc va dao dai ((cuu tre) OR (cau tren))*".