Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu hanh » thuc hanh, thu thanh, thuy hanh
hieu van » thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
tu sach » thu sach, su sach, te sach
hanh xa » hanh va, hanh ma, hanh xu
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
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 xa hoi. ((((hieu ve) OR (hieu van))) 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 xa hoi. ((((hieu ve) OR (hieu van))) 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 xa hoi. ((((hieu ve) OR (hieu van))) or (hieu va)) cam xuc va hanh lam va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach thu hanh xa hoi. ((((hieu ve) OR (hieu van))) or (hieu va)) cam xuc va hanh lam va thiet*.