Perhaps you should try some spelling variations:
thieu tach » chiet tach, chieu sach, hieu cach
thien hach » thien thanh, hien hanh
quang dong » quan dong, quang cuong, quang hoang
quang dung » quang trung, ung dung, cuong dung
hanh tang » hanh trang, anh tang, hanh mang
dan toan » van toan, dan than, manh toan
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 tach) or (thien hach)) - hanh tang ((quang dong) OR (quang dung)) huong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tach) OR (thien hach)) - hanh tang ((quang dong) OR (quang dung)) huong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu tach) or (thien hach)) - hanh tang ((quang dong) OR (quang dung)) huong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tach) or (thien hach)) - hanh tang ((quang dong) OR (quang dung)) huong dan toan cau*.