Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
thu nang » thi nang, thu hang, thu bang
sach thu » sach thue, sach thieu, sach tham
vien cac » vien bach, vien dai, vien da
te sach » toc sach
nang xa » nang x, lang xa, nang ma
ve cac » va cac
cua te » cua tu

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 thu nang xa hoi. hieu ((ve cac) OR (vien cac)) luc ((van hanh) or (van thanh)) dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang xa hoi. hieu ((ve cac) OR (vien cac)) luc ((van hanh) OR (van thanh)) dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang xa hoi. hieu ((ve cac) OR (vien cac)) luc ((van hanh) or (van thanh)) dai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang xa hoi. hieu ((ve cac) OR (vien cac)) luc ((van hanh) or (van thanh)) dai cua te*.