Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
quoc nhanh » quoc hanh, quoc nhan, quoc thanh
quoc khanh » ngoc khanh, quoc thinh
chong dich » luong dich, hang dich
cua trung » cua truong, xuan trung, cua nhung
thanh van » thanh san, thanh toan, thanh phan
sach hoc » cach hoc, sach hoi, mach hoc
dich dan » dich can, dich dao, dich han
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
dan hoi » dan hoc, dai hoi, van hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach hoc tap, nghien cua trung ((quoc nhanh) OR (quoc khanh)) chong dich dan hoi va thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoc tap, nghien cua trung ((quoc nhanh) OR (quoc khanh)) chong dich dan hoi va thanh van".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cua trung ((quoc nhanh) OR (quoc khanh)) chong dich dan hoi va thanh van*.