Perhaps you should try some spelling variations:
thanh trung » thanh tung
tran dang » tran hoang, tranh hang, tran van
chi xanh » chi anh, chi danh, chi hanh
cong tac » cong ty
tren cay » trien cay, tren may, tren ca
doi chi » doi khi
ten cay » gen cay, trien cay, benh 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 ((tran dang) OR (tran quang)) cong tac ((tren cay) or (ten cay))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - thanh trung ((tran dang) OR (tran quang)) cong tac ((tren cay) OR (ten cay)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - thanh trung ((tran dang) OR (tran quang)) cong tac ((tren cay) or (ten cay))".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - thanh trung ((tran dang) OR (tran quang)) cong tac ((tren cay) or (ten cay))*.