Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
sach thu » sach thue, sach thieu, sach tham
thu hanh » thuc hanh, thu thanh, thuy hanh
hanh lam » thanh lap, hanh kem, dinh lam
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
hanh xa » hanh ma, hanh xu, canh xa
xuc va » duc va, tuc va, luc va

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