Perhaps you should try some spelling variations:
van vanh » van anh, van manh, van canh
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
ve cac » vien cac
cua tu » cua tuc, cua su, cua cu

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