Perhaps you should try some spelling variations:
nganh hang » ngan hang, nhanh thang, nganh thanh
chuc nganh » chuc nang, hoc nganh, cac nganh
cau chuc » cau chu, cau phuc, canh chuc
thu sach » thuat sach, thuoc sach, thu hoach
thu hang » thi hang, thuc hanh, thu huong
tu sach » su sach, te sach, tu cach
ca tren » cau tren, la tren, co tren
hang vi » hang va, hanh vi, hang di
cu tren » tu tren, dua tren
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
ve cau » ke cau, va cau, ve cac

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) OR (thu sach)) thu hang xa hoi. hieu ve cau chuc nganh hang vi ((ca tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) thu hang xa hoi. hieu ve cau chuc nganh hang vi ((ca tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) thu hang xa hoi. hieu ve cau chuc nganh hang vi ((ca tren) or (cu tren))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) thu hang xa hoi. hieu ve cau chuc nganh hang vi ((ca tren) or (cu tren))*.