Perhaps you should try some spelling variations:
sach thuc » cach thuc, sach thu, sach thue
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
hanh hai » thanh hai, nhanh hai, hang hai
thuc day » thuc dan, thuc vat
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan
hieu ve » hieu va, hieu van
hanh xa » hanh va, hanh ma, hanh xu
ve am » va am

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 thuc hanh xa hoi. hieu ve am ((thuc va) or (thuc day)) hanh hai ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thuc hanh xa hoi. hieu ve am ((thuc va) OR (thuc day)) hanh hai ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach thuc hanh xa hoi. hieu ve am ((thuc va) or (thuc day)) hanh hai ((va triet) or (su triet))*.