Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
van thanh » ban thanh, van tuan
thai cua » than cua, tai cuc, tri cua
hieu van » thien van, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
cao duc » dao duc, cao suc, giao duc
sach ly » sach y, sach lo, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
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: tu sach ly nang xa hoi. ((hieu van) OR (hieu va)) ((pham duc) or (cao duc)) van thanh thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang xa hoi. ((hieu van) OR (hieu va)) ((pham duc) OR (cao duc)) van thanh thai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang xa hoi. ((hieu van) OR (hieu va)) ((pham duc) or (cao duc)) van thanh thai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang xa hoi. ((hieu van) OR (hieu va)) ((pham duc) or (cao duc)) van thanh thai cua te*.