Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
thang hang » thanh hang, thanh hoang, thanh thang
nhung cong » dung cong, thong cong, hang cong
hang hang » nang hang, cang thang, hung thang
cua nhung » va nhung
cong tang » cong thang, cong tan, cong lang
tang tan » tang van, tang tai, tang dan
tan cau » toan cau, van cau, tan ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) OR (thien hach)) - ((hang hang) or (thang hang)) cua nhung cong tang tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - ((hang hang) OR (thang hang)) cua nhung cong tang tan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (thien hach)) - ((hang hang) or (thang hang)) cua nhung cong tang tan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (thien hach)) - ((hang hang) or (thang hang)) cua nhung cong tang tan cau*.