Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach nay
tay dong » tac dong, day dong, tai dong
hang tai » hang va, dung tai
so sach » so sanh, bo sach, co sach
xay hoi » xa hoi, cay phoi, gay thoi
tay hoi » tay ho, tao hoi, tay thai
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
cuc te » cua te, cuc thue, cuc tieu

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 tay dong ((xay hoi) or (tay hoi)). lieu va cac ((luc van) OR (duc van)) hang tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tay dong ((xay hoi) OR (tay hoi)). lieu va cac ((luc van) OR (duc van)) hang tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tay dong ((xay hoi) or (tay hoi)). lieu va cac ((luc van) OR (duc van)) hang tai cuc te".
• Adding a wildcard symbol may retrieve word variants: so sach tay dong ((xay hoi) or (tay hoi)). lieu va cac ((luc van) OR (duc van)) hang tai cuc te*.