Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va danh, ban hanh
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
ma hoi » mai hoi, ma hoa, me hoi
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thi nang ((ma hoi) OR (xa hoi)). hieu ve pham duc ((va hanh) or (va thanh)) lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thi nang ((ma hoi) OR (xa hoi)). hieu ve pham duc ((va hanh) OR (va thanh)) lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thi nang ((ma hoi) OR (xa hoi)). hieu ve pham duc ((va hanh) or (va thanh)) lai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach thi nang ((ma hoi) OR (xa hoi)). hieu ve pham duc ((va hanh) or (va thanh)) lai cua te*.