Perhaps you should try some spelling variations:
hoan thanh » hoang thanh, ban thanh, van thanh
thanh don » thanh dong, thanh son, thanh do
don thuoc » dong thuoc, dung thuoc, dang thuoc
sach hoi » sach moi, cach thoi, hoach hoi
sach doi » sach moi, sach dao, sach bai
mon hoan » mon hoa, mon toan, cong hoan
thuoc ma » hoc ma, duoc ma
phap han » phap hoan, phap phan, phap nang
cuu mon » cuu mo, cuu mot, cuu cong
va phap » va phat, ban 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: tu ((sach hoi) or (sach doi)) tap, nghien cuu mon hoan thanh don thuoc ma hoi va phap han~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoi) OR (sach doi)) tap, nghien cuu mon hoan thanh don thuoc ma hoi va phap han.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoi) or (sach doi)) tap, nghien cuu mon hoan thanh don thuoc ma hoi va phap han*.