Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lai » thanh hai, thanh lap, thanh loi
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
cao duc » dao duc, cao suc, giao duc
lai cua » dai cua, hai cua, lai chau
cam duc » cam xuc, pham duc, nam duoc
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tu » cua tuc, cua su, cua cu

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 ty nang xa hoi. ((hieu van) OR (thien van)) ((cam duc) or (cao duc)) ban thanh lai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu van) OR (thien van)) ((cam duc) OR (cao duc)) ban thanh lai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((hieu van) OR (thien van)) ((cam duc) or (cao duc)) ban thanh lai cua tu*".