Perhaps you should try some spelling variations:
thanh trung » thanh tung
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cap phan » cac phan, cao phan, cap han
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
cap can » cap han, cap van, tap can

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 - thanh trung ((cap can) or (cap phan)) cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh trung ((cap can) OR (cap phan)) cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh trung ((cap can) or (cap phan)) cong dan than cau*.