Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
hoc thanh » hoc nhanh, hoan thanh, hoc phan
sach dao » lanh dao
thuoc xa » thuoc ma, thuoc va, thuoc la
tu sach » thu sach, su sach, te sach
dao tac » dao tao, dao tuc, dao tay
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi cau » hoi chu, hoc cau, hoa cau
hoi cua » hoi chuc
nhan va » nhan tai, nhan dan, nhan tao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach dao tac, nghien cuu mon hoc thanh cong thuoc xa ((hoi cau) or (hoi cua)) nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach dao tac, nghien cuu mon hoc thanh cong thuoc xa ((hoi cau) OR (hoi cua)) nhan va.
• Adding a wildcard symbol may retrieve word variants: tu sach dao tac, nghien cuu mon hoc thanh cong thuoc xa ((hoi cau) or (hoi cua)) nhan va*.