Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh tang » hanh trang, anh tang, hanh mang
cong san » cong tac
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
tang va » trang va, tang van, thang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet tach - hanh tang va nhung ((cong san) or (cong ty)) ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh tang va nhung ((cong san) OR (cong ty)) ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh tang va nhung ((cong san) or (cong ty)) ((toan cau) or (toan ban))*.