Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thong cong » trong cong, tong cong, thong thong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cap » truong cao, trung tam
cong doan » cong dan, cong hoan, dong doanh
doan phan » doanh phan, toan phan, dan phan
dung cua » dung luan, dung cho
phan cau » phan dau, phan cac, phan tu

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