Perhaps you should try some spelling variations:
hoc tcong » hoc cong, hoc trong, hoc thong
sach phan » sach han, mach phan, sach phat
tcong tin » thong tin, trong tin, trong tien
thu sach » thuat sach, thuoc sach, thu hoach
nguoi bo » nguoi co, nguoi do, nguoi o
ve nguoi » va nguoi, le nguoi, ve nguon
sach cha » sach nha, sach che, sach ha
cong tin » cong tinh, cong tan, dong tin
ve giai » va giai, ve giao, de giai
tu sach » su sach, te sach, tu cach
phan ve » phan le, phan va, pha ve
me giai » de giai, ke giai, le giai
bo cong » so cong, cao cong, hoc cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach cha ((me giai) or (ve giai)) hoc tcong tin ) or ( tu sach phan ve nguoi bo cong tin ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach cha ((me giai) OR (ve giai)) hoc tcong tin ) OR ( tu sach phan ve nguoi bo cong tin )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach cha ((me giai) or (ve giai)) hoc tcong tin ) or ( tu sach phan ve nguoi bo cong tin ))*.