Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu hanh » thuc hanh, thu thanh, thuy hanh
su triet » su viet, su tien, ve triet
hanh lam » thanh lap, hanh kem, dinh lam
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
hieu ve » hieu van
hanh va » hang va, hanh vi
xuc va » duc va, tuc va, luc va
va hoi » xa hoi, va hoc, va hoa
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 va hoi. ((hieu ve) or (hieu va)) cam xuc va hanh lam ((su triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu hanh va hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh lam ((su triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu sach thu hanh va hoi. ((hieu ve) or (hieu va)) cam xuc va hanh lam ((su triet) or (va thiet))*.