Perhaps you should try some spelling variations:
trien thuat » thien thuat, trien hoat, chien thuat
tran thuat » trong thuat, tran tuan, tran thuy
hang cong » dang cong, hang nong, bang cong
cong bang » cuong bang, dong bang, hong bang
bang phan » nang phan, bang nhan, bang thanh
thi phap » thi hai, thi ha, thi hao
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo phap) OR (thi phap)) tinh - hanh ((tran thuat) or (trien thuat)) hang cong bang phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo phap) OR (thi phap)) tinh - hanh ((tran thuat) OR (trien thuat)) hang cong bang phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo phap) OR (thi phap)) tinh - hanh ((tran thuat) or (trien thuat)) hang cong bang phan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo phap) OR (thi phap)) tinh - hanh ((tran thuat) or (trien thuat)) hang cong bang phan cau*.