Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thieu xanh » chieu xanh, hieu manh, thien anh
hanh hanh » xanh hanh, nhanh thanh, thanh thanh
dung cong » dung trong
hanh han » hanh nhan, hanh phan, hanh san
cong van » cong vang, cong san, song van
va dung » van dung, va duong, vat dung
van tan » van tuan, van ban, van tai
tan ca » tan cua, tang ca, dan ca

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien thanh)) - ((hanh hanh) OR (hanh han)) va dung cong van tan ca~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (thien thanh)) - ((hanh hanh) OR (hanh han)) va dung cong van tan ca~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien thanh)) - ((hanh hanh) OR (hanh han)) va dung cong van tan ca*.