Perhaps you should try some spelling variations:
thanh trung » thanh tung
thanh dang » thanh hang, thanh dong, thanh dung
thanh dan » thanh san, thanh van, thanh dat
chi xanh » chi anh, chi danh, chi hanh
cong tac » cong ty
tren cau » tren ca, tren cay, tren tau
doi chi » doi khi
ten cay » tren cay, gen cay, trien cay

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi xanh - thanh trung ((thanh dang) OR (thanh dan)) cong tac ((tren cau) or (ten cay))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - thanh trung ((thanh dang) OR (thanh dan)) cong tac ((tren cau) OR (ten cay)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - thanh trung ((thanh dang) OR (thanh dan)) cong tac ((tren cau) or (ten cay))".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - thanh trung ((thanh dang) OR (thanh dan)) cong tac ((tren cau) or (ten cay))*.