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

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 ((ty hang) or (ly hang)) xa hoi. hieu ve tham thuc ha thanh de ((su triet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ly hang)) xa hoi. hieu ve tham thuc ha thanh de ((su triet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (ly hang)) xa hoi. hieu ve tham thuc ha thanh de ((su triet) or (hoa viet))*.