Perhaps you should try some spelling variations:
cach thuc » anh thuc
sach tin » sach tien, sach kinh, sach tren
tin mang » tin nang, ninh mang, tien manh
van tuan » van quan, van ban, anh tuan
te sach » toc sach
mang xa » lang xa, mang may, dang xay
hieu ve » hieu va, hieu van
cac thu » cac thuat, cac thoi
tuan vi » quan vi, luan vi, quans vi
xu tren » tu tren, cu tren, xa tren
vi xu » va xu, ve xu, vi su

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 tin mang xa hoi. hieu ve ((cach thuc) OR (cac thu)) van tuan vi xu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tin mang xa hoi. hieu ve ((cach thuc) OR (cac thu)) van tuan vi xu tren".
• Adding a wildcard symbol may retrieve word variants: te sach tin mang xa hoi. hieu ve ((cach thuc) OR (cac thu)) van tuan vi xu tren*.