Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
bia cua » gia cua, via cua, gian cua
anh bia » anh giao
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
cac co » cac cong
cac lo » cac lop, cac bo, cac ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuoc sach)) ky dang xa hoi. hieu ve ((cac lo) or (cac co)) van anh bia cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuoc sach)) ky dang xa hoi. hieu ve ((cac lo) OR (cac co)) van anh bia cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuoc sach)) ky dang xa hoi. hieu ve ((cac lo) or (cac co)) van anh bia cua tre*.