Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
hoc thanh » hoc nhanh, hoan thanh, hoc phan
sach hoi » sach doi, sach moi, cach thoi
cuu hoan » luu hoang, cuu van, cuu khoa
thuoc ma » hoc ma, duoc ma
phan van » pham van, thanh van, luan van
te sach » toc sach
cuu hoa » cuu khoa, cau hoa, cuu hoc
va phan » van phan, va phat, va phap
ma hoi » mai hoi, xa hoi, ma hoa

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 hoi dap, nghien ((cuu hoa) OR (cuu hoan)) hoc thanh cong thuoc ma hoi va phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoi dap, nghien ((cuu hoa) OR (cuu hoan)) hoc thanh cong thuoc ma hoi va phan van".
• Adding a wildcard symbol may retrieve word variants: te sach hoi dap, nghien ((cuu hoa) OR (cuu hoan)) hoc thanh cong thuoc ma hoi va phan van*.