Perhaps you should try some spelling variations:
sach thanh » sach tranh, sach tham, danh thanh
sach nganh » sach ngan, sach tranh, cac nganh
hong thai » cong thai, hong ha, hinh thai
hoa thai » hoa phan, hoa chat, hoa dai
so sach » so sanh, bo sach, co sach
su sach » vu sach
y khi » ly khi, ky khi, my khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach nganh y khi đong luc ) or ( su sach thanh ((hoa thai) OR (hong thai)) đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach nganh y khi đong luc ) OR ( su sach thanh ((hoa thai) OR (hong thai)) đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sach nganh y khi đong luc ) or ( su sach thanh ((hoa thai) OR (hong thai)) đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( so sach nganh y khi đong luc ) or ( su sach thanh ((hoa thai) OR (hong thai)) đong luc ))*.