Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
chinh cam » chinh ca, chinh cau, chinh chau
chinh can » chinh ca, chinh ban, chinh cau
cong manh » cong danh, duong manh, cong thanh
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((chinh cam) OR (chinh can)) nhung ((cong manh) OR (cong san)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((chinh cam) OR (chinh can)) nhung ((cong manh) or (cong san)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((chinh cam) OR (chinh can)) nhung ((cong manh) or (cong san)) toan cau*.