Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
cong ngang » cong nhan, cong quang, cong lang
thanh chau » thanh cha, thanh cham, thanh chu
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong cang » cong cong, cong lang, cong bang
cong vang » cong lang, cong quang, cong san

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