Perhaps you should try some spelling variations:
thieu tach » thien hach, chiet tach, chieu sach
chinh luan » chinh ngan, trinh luan, binh luan
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
dang toan » dang tran, dung toan, dang thanh
chinh ca » chinh ta, chinh va, chinh tai
dan toan » van toan, dan than, manh toan

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 - hanh ((chinh luan) or (chinh ca)) dung cong ((dang toan) or (dan toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tach - hanh ((chinh luan) OR (chinh ca)) dung cong ((dang toan) OR (dan toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu tach - hanh ((chinh luan) or (chinh ca)) dung cong ((dang toan) or (dan toan)) cao*.