Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trang ngan » trong nganh, trong ngang, trinh ngan
hoc thieu » toc thieu, hoc hien
toan ngan » tai ngan, toan ban, toan nha
cong manh » duong manh, cong thanh, hoang manh
cong danh » cuong danh, cong dan, cong thanh
toan cau » toan cao, toan ban, toan tap

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