Perhaps you should try some spelling variations:
nhanh chong » thanh cong, khanh phong
chong thuoc » khong thuoc, cong thuc, hong phuoc
cuu cong » cua cong, thu cong, cac cong
co nhanh » co thanh, co hanh, co phanh
thuoc xa » thuoc ma, thuoc va, thuoc la
van gian » van giang, dan gian, van giao
gian dan » gian lang
tu bach » vu bach, tu cach, tu bac
mai tap » mai tat, mai tan, hai tap
cong co » dong co, cong cu, cong so
hoi van » hoi va, hoi dan, hai van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bach ((mai tap) OR (bai tap)), nghien cuu cong co nhanh chong thuoc xa hoi van gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bach ((mai tap) OR (bai tap)), nghien cuu cong co nhanh chong thuoc xa hoi van gian dan".
• Adding a wildcard symbol may retrieve word variants: tu bach ((mai tap) OR (bai tap)), nghien cuu cong co nhanh chong thuoc xa hoi van gian dan*.