Perhaps you should try some spelling variations:
thang tai » hang tai, tang tai, thanh tai
tay dong » tac dong, day dong, tai dong
dong xay » dang xay, cong xay, mong xay
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
duc van » duc tan, duc manh, duc phan
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) OR (co sach)) tay dong xay hoi. hieu va cac ((duc van) or (duc va)) thang tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) tay dong xay hoi. hieu va cac ((duc van) OR (duc va)) thang tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) tay dong xay hoi. hieu va cac ((duc van) or (duc va)) thang tai cuc te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) tay dong xay hoi. hieu va cac ((duc van) or (duc va)) thang tai cuc te*.