Perhaps you should try some spelling variations:
manh tang » manh thang, manh tung, anh tang
tang tai » hang tai, dung tai, sang tao
tac dung » sach dung, xay dung, tin dung
dung xay » dang xay, dung may, dung tay
sach tac » sach bac, sach tai, sach tham
so sach » so sanh, bo sach, co sach
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
cac duc » cac du, cac dac, cac nuoc
cao duc » dao duc, cao suc, giao duc
cuc te » cua te, cuc tieu
thue » thu, thuc, thuy

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