Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
ve triet » va trien, su triet
thanh xa » thanh ha, thanh va, thanh ba
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
tu sach » thu sach, su sach, te sach
ve cac » va cac, vien cac
lam ve » la ve, lam vu, nam ve

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 thanh xa hoi. hieu ((ve cac) or (ve cham)) truc ((va hanh) or (va danh)) lam ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi thanh xa hoi. hieu ((ve cac) OR (ve cham)) truc ((va hanh) OR (va danh)) lam ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi thanh xa hoi. hieu ((ve cac) or (ve cham)) truc ((va hanh) or (va danh)) lam ve triet*.