Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
nhung cong » dung cong, thong cong, nhung don
hoc thieu » toc thieu, hoc hien
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
hang cong » dang cong, hang nong, bang cong
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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