Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
duc ngon » duc ngoc, dung ngon, duoi ngon
duc ngan » duc nhan, luc ngan, dung ngan
bo sach » co sach, hoc sach
ty hang » ly hang, thi hang, thu hang
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
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: bo sach ((ty hang) or (ty xang)) xa hoi. hieu ve cam ((duc ngan) OR (duc ngon)) thanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ((ty hang) OR (ty xang)) xa hoi. hieu ve cam ((duc ngan) OR (duc ngon)) thanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ((ty hang) or (ty xang)) xa hoi. hieu ve cam ((duc ngan) OR (duc ngon)) thanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: bo sach ((ty hang) or (ty xang)) xa hoi. hieu ve cam ((duc ngan) OR (duc ngon)) thanh vai cua te*.