Perhaps you should try some spelling variations:
thuc dang » thuoc dang, thuc dan, thuc dung
dang hanh » dang thanh, ban hanh, dang van
hanh dao » lanh dao, thanh dat, thanh dam
cam thuc » am thuc, nam thuc, cam thu
hoang xa » hoang ha, hoang va, hoang xuan
hieu ve » hieu va, hieu van
hang xa » hang va, hang ca, lang xa
su tien » su kien, su hien, tu tieng
ve cam » ve cham, ve cac, va cam
dao su » dao suu, dan su, cao su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sanh) or (do sanh)) thi ((hang xa) or (hoang xa)) hoi. hieu ve cam thuc dang hanh dao su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (do sanh)) thi ((hang xa) OR (hoang xa)) hoi. hieu ve cam thuc dang hanh dao su tien.
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (do sanh)) thi ((hang xa) or (hoang xa)) hoi. hieu ve cam thuc dang hanh dao su tien*.