Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue nang » thien nang, thuat nang, thi nang
danh viet » anh viet, ninh viet, nang viet
dinh viet » ninh viet, trinh viet, sinh vien
te sach » toc sach
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
ma hoi » xa hoi, ma hoa, me hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thue nang ((ma hoi) OR (mai hoi)). hieu ve cac duc va ((dinh viet) or (danh viet)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thue nang ((ma hoi) OR (mai hoi)). hieu ve cac duc va ((dinh viet) OR (danh viet)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thue nang ((ma hoi) OR (mai hoi)). hieu ve cac duc va ((dinh viet) or (danh viet)) cua tre*".