Perhaps you should try some spelling variations:
duc nhan » dac nhan, luc nhan, duc han
duc phan » dung phan, duc thang, duc phung
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, co sach
ty hang » ly hang, thi hang, thu hang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
vai cua » dai cua, hai cua, lai cua
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 ((ty hang) or (ty xang)) xa hoi. hieu ve pham ((duc nhan) OR (duc phan)) hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty hang) OR (ty xang)) xa hoi. hieu ve pham ((duc nhan) OR (duc phan)) hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty hang) or (ty xang)) xa hoi. hieu ve pham ((duc nhan) OR (duc phan)) hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty hang) or (ty xang)) xa hoi. hieu ve pham ((duc nhan) OR (duc phan)) hanh vai cua te*.