Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
hanh de » hanh ve, hanh kem
van hai » van ha, van chat, van phan
van hau » van ha, van dau, van hac
nang xa » nang x, lang xa, nang ma
ca tren » cau tren, cu tren, la tren
y nang » ky nang, ly nang, v nang

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