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

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 ((ve nam) OR (he nam)) thu vat thanh vai ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky hang hoa hoi. hieu ((ve nam) OR (he nam)) thu vat thanh vai ((su triet) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky hang hoa hoi. hieu ((ve nam) OR (he nam)) thu vat thanh vai ((su triet) or (su viet))*".