Perhaps you should try some spelling variations:
khoi thuat » ki thuat, hoc thuat
trinh quan » tinh quang, trinh luat, trinh han
trinh van » trinh han, trinh toan, dinh van
dung cong » dung trong
ho thuat » hoc thuat, ho thuan, thu thuat
cong van » cong vang, cong san, song van
van phan » van phong, van thanh, luan phan
phan dau » phan tu, hang dau

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) OR (khoi thuat)) tinh - canh ((trinh van) or (trinh quan)) dung cong van phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho thuat) OR (khoi thuat)) tinh - canh ((trinh van) OR (trinh quan)) dung cong van phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thuat) OR (khoi thuat)) tinh - canh ((trinh van) or (trinh quan)) dung cong van phan dau".
• Adding a wildcard symbol may retrieve word variants: ((ho thuat) OR (khoi thuat)) tinh - canh ((trinh van) or (trinh quan)) dung cong van phan dau*.