Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hoang xa » hoang ha, hoang va, hoang xuan
hanh dao » lanh dao, thanh dat, thanh dam
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
hieu ve » hieu va, hieu van
hang xa » hang va, hang ca, lang xa
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 dan hanh dao su triet~.
• 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 dan hanh dao su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sanh) OR (do sanh)) thi ((hang xa) or (hoang xa)) hoi. hieu ve cam thuc dan hanh dao su triet".
• Adding a wildcard symbol may retrieve word variants: ((so sanh) OR (do sanh)) thi ((hang xa) or (hoang xa)) hoi. hieu ve cam thuc dan hanh dao su triet*.