Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh vai » thanh hai, thanh van, thanh tai
hang hoa » hang khoa, thanh hoa, hang va
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 le » hieu ve, hieu he, hieu ly
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky hang » ky nang, ly hang, ky dang
su viet » so viet
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: tu sach ky hang hoa hoi. hieu le nam thu vat thanh vai ((((su triet) OR (su tien))) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky hang hoa hoi. hieu le nam thu vat thanh vai ((((su triet) OR (su tien))) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky hang hoa hoi. hieu le nam thu vat thanh vai ((((su triet) OR (su tien))) or (su viet))*".