Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, vu sach
tu cach » tu cac
cong he » cong che, cong ha, cong de
tien va » dien va, thien van
tin va » tinh va, tin vao, tan va
thong » trong

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) or (((tu sach) OR (tu cach)))) nganh cong he thong ((tin va) or (tien va)) truyen thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (((tu sach) OR (tu cach)))) nganh cong he thong ((tin va) OR (tien va)) truyen thong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (((tu sach) OR (tu cach)))) nganh cong he thong ((tin va) or (tien va)) truyen thong".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (((tu sach) OR (tu cach)))) nganh cong he thong ((tin va) or (tien va)) truyen thong*.