Perhaps you should try some spelling variations:
hanh hoi » hanh thoi, hanh noi, hanh hoa
kho tang » cao tang
thue va » thuc va, thuyet va, thuc vat
hieu le » hieu ve, hieu he, hieu ly
su sach » so sach, vu sach
ky tang » ky nang, ky dang, ky trong
hoi cua » hoi chuc
ma hoi » mai hoi, xa hoi, ma hoa
le nam » ly nam, he nam, le na

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 ((ky tang) OR (kho tang)) ma hoi. hieu le nam ((thu ha) or (thue va)) hanh hoi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (kho tang)) ma hoi. hieu le nam ((thu ha) OR (thue va)) hanh hoi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) OR (kho tang)) ma hoi. hieu le nam ((thu ha) or (thue va)) hanh hoi cua vat".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) OR (kho tang)) ma hoi. hieu le nam ((thu ha) or (thue va)) hanh hoi cua vat*.