Perhaps you should try some spelling variations:
thu thanh » thu thang, tu thanh, thuan thanh
thu hanh » thuc hanh, thuy hanh, thi hanh
hanh lam » thanh lap, hanh kem, hanh va
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu van
xuc va » duc va, tuc va, luc va
lam va » nam va, dam va, lam ha
thiet » thieu

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 ((thu hanh) OR (thu thanh)) xa hoi. ((hieu ve) or (hieu va)) cam xuc va hanh lam va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thu hanh) OR (thu thanh)) xa hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh lam va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thu hanh) OR (thu thanh)) xa hoi. ((hieu ve) or (hieu va)) cam xuc va hanh lam va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thu hanh) OR (thu thanh)) xa hoi. ((hieu ve) or (hieu va)) cam xuc va hanh lam va thiet*.