Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
thanh de » hanh de, thanh ve, thanh do
nang xa » nang x, lang xa, nang ma
van hau » van ha, van hai, van dau
hau duc » huu duc, ha duc, pham duc
duc van » duc va, duc tan, duc manh
cua tre » cuu tre, cua triet, dua tren
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: toc ((sach 2) or (sach y)) nang xa hoi. hieu van hau duc van thanh de ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach 2) OR (sach y)) nang xa hoi. hieu van hau duc van thanh de ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach 2) or (sach y)) nang xa hoi. hieu van hau duc van thanh de ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc ((sach 2) or (sach y)) nang xa hoi. hieu van hau duc van thanh de ((cua tre) OR (cua te))*.