Perhaps you should try some spelling variations:
trien thuoc » trien thuc, trien thuong, tin thuoc
thuoc sach » hoc sach, nuoc sach, thuat sach
sach dien » mach dien, sach tien, dich dien
hoa huyen » hoi huyen, hoa truyen, hong huyen
sach khoa » bach khoa, sach nha, anh khoa
luan cong » luong cong, luan chung, luan luong
luat cong » thuat cong, luat chung, cua cong
san tinh » ban tinh, man tinh, son tinh
tu sach » thu sach, su sach, te sach

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 dien hoa huyen đe ky thuat: trien thuoc sach khoa ((luan cong) OR (luat cong)) san tinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach dien hoa huyen đe ky thuat: trien thuoc sach khoa ((luan cong) OR (luat cong)) san tinh".
• Adding a wildcard symbol may retrieve word variants: tu sach dien hoa huyen đe ky thuat: trien thuoc sach khoa ((luan cong) OR (luat cong)) san tinh*.