Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
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
hanh de » hanh ve, hanh kem
ve nam » va nam, le nam, te nam
he nam » ha nam, nghe nam
cua tu » cua tuc, cua su, cua cu

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

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