Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
ha thanh » va thanh, pham thanh, phan thanh
thi hang » thi hanh, thi nang, thi hong
su triet » su viet, su tien, ve triet
ly quang » le quang, vu quang
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu sach
ve tham » va tham, ve cham, vi tham
thuc ha » thu ha, thuc va, thuc hanh
hieu ve » hieu va, hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((thi hang) or (ly quang)) xa hoi. hieu ve tham thuc ha thanh di ((su triet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thi hang) OR (ly quang)) xa hoi. hieu ve tham thuc ha thanh di ((su triet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ((thi hang) or (ly quang)) xa hoi. hieu ve tham thuc ha thanh di ((su triet) or (hoa viet))*.