Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
va trien » va truyen, va tuyen, va tieng
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xang ma » tang ma, nang ma, sang ma
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
ve nam » he nam, va nam, le nam
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 ty xang ma hoa. hieu ve nam ((thuc va) or (thuc hanh)) hanh vai ((va trien) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang ma hoa. hieu ve nam ((thuc va) OR (thuc hanh)) hanh vai ((va trien) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty xang ma hoa. hieu ve nam ((thuc va) or (thuc hanh)) hanh vai ((va trien) or (va thiet))*.