Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
thang long » thanh cong
manh dung » manh hung, manh tung, anh dung
tat thang » nam thang, van thang, dat hang
dung tat » dung tai, dung dat, dung tay
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((thieu sach) OR (thien hach)) - manh dung tat thang long ((van toan) or (van tan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sach) OR (thien hach)) - manh dung tat thang long ((van toan) OR (van tan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sach) OR (thien hach)) - manh dung tat thang long ((van toan) or (van tan)) cao".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) OR (thien hach)) - manh dung tat thang long ((van toan) or (van tan)) cao*.