Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh hung, hanh dung
thanh tung » thanh cong
thong dong » thong duong, thuong dong, thong cong
hieu lang » chieu sang, hieu quang, nhieu tang
nhu hieu » nhu hien, nha hieu, nho hieu
dong van » duong van, dang van, dong von
tuan tap » tuan tai, tuyen tap, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: nhu hieu lang - ((thanh dung) OR (thanh tung)) toan thong dong van ((tuan tap) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nhu hieu lang - ((thanh dung) OR (thanh tung)) toan thong dong van ((tuan tap) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nhu hieu lang - ((thanh dung) OR (thanh tung)) toan thong dong van ((tuan tap) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: nhu hieu lang - ((thanh dung) OR (thanh tung)) toan thong dong van ((tuan tap) or (toan tap))*.