Perhaps you should try some spelling variations:
thanh rung » thanh trung, thanh tung, thanh hung
hoc thieu » hoc hien
rung khoa » trung khoa, dung khoa, truong khoa
khoa dung » hoc dung, khoa cong
trong tac » trong cac, tuong tac, trong tan
tac khang » tan khang, tao khang, bach khang
khang cau » hang cau, khang cu, khang chan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) OR (toc thieu)) xanh - thanh rung khoa dung trong tac khang cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) OR (toc thieu)) xanh - thanh rung khoa dung trong tac khang cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) OR (toc thieu)) xanh - thanh rung khoa dung trong tac khang cau*.