Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hien hanh » dieu hanh
cong vang » cong lang, cong quang, cong ngang
vang phan » van phan, nang phan, quang phan
phan lap » phan dau
song va » song van, dong va, song xa
son va » son la, lon va, son ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hanh - thanh ((son va) OR (song va)) thong cong vang phan lap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - thanh ((son va) OR (song va)) thong cong vang phan lap".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - thanh ((son va) OR (song va)) thong cong vang phan lap*.