Perhaps you should try some spelling variations:
thuat tac » thuat tach, thuat tao, thuat tai
thi nang » thi cong, ki nang, thi hanh
van hanh » van thanh, ban hanh, van anh
xay hoi » xa hoi, tay hoi, cay phoi
thi van » thi lan, thi hanh
nam vuc » nam vung, nam thuc, nam duoc
vuc van » duc van, luc van, thuc van
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
tac so » tai so, tac co, tac su
so van » su van, vo van
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat tac so van xay hoi. ((thi van) or (thi nang)) nam vuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat tac so van xay hoi. ((thi van) OR (thi nang)) nam vuc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat tac so van xay hoi. ((thi van) or (thi nang)) nam vuc van hanh di cua tre*.