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