Perhaps you should try some spelling variations:
thanh trung » thanh tung
thiet tach » chiet tach, thien hach, thuat tach
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong doan » cong dan, cong hoan, dong doanh
phan cau » phan cac, phan lap, toan cau
phan dau » hang dau

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 cua nhung cong doan ((phan cau) or (((phan dau) OR (phan tu))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh trung cua nhung cong doan ((phan cau) OR (((phan dau) OR (phan tu)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - thanh trung cua nhung cong doan ((phan cau) or (((phan dau) OR (phan tu))))".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh trung cua nhung cong doan ((phan cau) or (((phan dau) OR (phan tu))))*.