Perhaps you should try some spelling variations:
trien thuat » thien thuat, trien hoat, chien thuat
thiet tinh » thien tinh, thuyet tinh, chieu tinh
tran thuat » trong thuat, tran tuan, tran thuy
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cong tap » cuong tap, cong tac, cong tan
tap doan » tap quan
doan cau » toan cau, doan dau, doan cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet tinh - thanh ((tran thuat) or (trien thuat)) nhung cong tap doan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tinh - thanh ((tran thuat) OR (trien thuat)) nhung cong tap doan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tinh - thanh ((tran thuat) or (trien thuat)) nhung cong tap doan cau*.