Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
va triet » va trien, ve triet, cua triet
hanh lam » thanh lap, hanh kem, hanh va
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
hanh xa » hanh va, hanh ma, hanh xu
tuc va » thuc va, truc va, tuc xa
ve cac » va cac, vien cac
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 thi hanh xa hoi. hieu ((ve cac) or (ve chat)) tuc va hanh lam ((va triet) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh xa hoi. hieu ((ve cac) OR (ve chat)) tuc va hanh lam ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi hanh xa hoi. hieu ((ve cac) or (ve chat)) tuc va hanh lam ((va triet) OR (va thiet))".
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh xa hoi. hieu ((ve cac) or (ve chat)) tuc va hanh lam ((va triet) OR (va thiet))*.