Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
vat tinh » sat tinh, vat sinh, hoat tinh
tinh vai » tinh va, tinh hai, tinh bai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac thu » cach thuc, cac thoi
thu vat » thuc vat, thu va, thuat vat
su hien » su tien, thu hien, nhu hien
kien » bien, vien, tien

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) or (sach thu)) nang xa hoi. lieu va cac thu vat tinh vai ((su hien) OR (su kien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach thu)) nang xa hoi. lieu va cac thu vat tinh vai ((su hien) OR (su kien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach thu)) nang xa hoi. lieu va cac thu vat tinh vai ((su hien) OR (su kien))*".