Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
trung tuan » trung thanh, trung tam, truong thanh
chong cong » cong cong, thong cong, cuong cong
tran tuan » tran xuan, tran quang, tran thanh
manh toan » thanh toan, tinh toan
ho thuat » hoc thuat, ho thuan, khoi thuat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho thuat mach - manh ((trung tuan) or (tran tuan)) chong cong ((manh toan) OR (anh tuan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thuat mach - manh ((trung tuan) OR (tran tuan)) chong cong ((manh toan) OR (anh tuan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho thuat mach - manh ((trung tuan) or (tran tuan)) chong cong ((manh toan) OR (anh tuan)) cao".
• Adding a wildcard symbol may retrieve word variants: ho thuat mach - manh ((trung tuan) or (tran tuan)) chong cong ((manh toan) OR (anh tuan)) cao*.