Perhaps you should try some spelling variations:
thanh duoc » hanh duoc, tranh duoc, thanh phuoc
van thanh » ban thanh, van tuan
thanh ve » hanh ve, thanh va, thanh vien
sach thu » sach thue, sach thieu, sach tham
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cua tre » cuu tre, cua triet, dua tren
duoc va » nuoc va, duc va, duoc ma
sach tu » cach tu, sach ty, sach uu
nang xa » nang x, lang xa, nang ma
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: su ((sach tu) OR (sach thu)) nang xa hoi. hieu van thanh duoc va thanh ve ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach thu)) nang xa hoi. hieu van thanh duoc va thanh ve ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tu) OR (sach thu)) nang xa hoi. hieu van thanh duoc va thanh ve ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) OR (sach thu)) nang xa hoi. hieu van thanh duoc va thanh ve ((cua tre) or (cua te))*.