Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cua nhung » va nhung
manh toan » thanh toan, anh tuan, tinh toan
tung cua » trung cua, tuong cua, dung cua
dan than » dan chan, ban than, van than
van chat » cao 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 tung cua nhung cong ((((dan than) or (manh toan))) or (van chat)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh tung cua nhung cong ((((dan than) OR (manh toan))) OR (van chat)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh tung cua nhung cong ((((dan than) or (manh toan))) or (van chat)) cau*.