Perhaps you should try some spelling variations:
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, dung cua
trung cap » truong cao, trung tam
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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) OR (trung cap)) nhung cong ((dan than) OR (dan chan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - thanh ((trung cua) OR (trung cap)) nhung cong ((dan than) OR (dan chan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh ((trung cua) OR (trung cap)) nhung cong ((dan than) OR (dan chan)) cau*.