Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
thuc va » thuc vat, thuc dan, thuc day
hang ma » hang va, hang ca, tang ma
hieu ve » hieu va, hieu van
ly hang » ly quang
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, xa hoi, ma hoa
thiet » thieu

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 ly hang ma hoi. hieu ve nam ((thuc va) or (thuc hanh)) hanh vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly hang ma hoi. hieu ve nam ((thuc va) OR (thuc hanh)) hanh vai ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach ly hang ma hoi. hieu ve nam ((thuc va) or (thuc hanh)) hanh vai ((va triet) or (va thiet))*.