Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
nganh cong » nhanh chong, thanh cong
thuoc sach » hoc sach, nuoc sach, thuat sach
nganh khoa » nganh hoa, nganh khong, doanh khoa
cong khi » cong thai, khong khi, co khi
khoa khi » khoa kham, khong khi, khoa khoa
vu sach » vu bach, su sach, vu khach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vu sach nganh cong khi đong luc ) or ( thuoc sach nganh khoa khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach nganh cong khi đong luc ) OR ( thuoc sach nganh khoa khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( vu sach nganh cong khi đong luc ) or ( thuoc sach nganh khoa khi đong luc ))*.