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

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