Perhaps you should try some spelling variations:
thuat tach » thuat sach, thuat mach, thuat tac
hoc thuat » hoc thuyet, hoc thuc, hoc chat
tranh cua » doanh cua, manh cua
dung cong » dung trong
hach toan » thanh toan, manh toan
cua dung » cua dang, cua dong, qua dung
tap toan » tap doan, tap quan, bai toan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuat tach - canh tranh cua dung cong ((tap toan) or (hach toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuat tach - canh tranh cua dung cong ((tap toan) OR (hach toan)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc thuat tach - canh tranh cua dung cong ((tap toan) or (hach toan)) ban*.