Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh vai » thanh hai, thanh van, thanh tai
dang hoa » dang hoai, dang khoa, dong hoa
su triet » ve triet
sach ky » sac ky, sach y, sach ty
su tien » su kien, su hien, tu tieng
tu sach » thu sach, su sach, te sach
thu vat » thuc vat, thu va, thuat vat
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky dang » ky nang, ky danh
su viet » so viet
ve nam » he nam, va nam, le nam

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang hoa hoi. hieu ve nam thu vat thanh vai ((((su triet) OR (su tien))) OR (su viet))~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang hoa hoi. hieu ve nam thu vat thanh vai ((((su triet) or (su tien))) or (su viet))*.