Perhaps you should try some spelling variations:
sach thanh » sach tranh, sach tham, danh thanh
sanh nganh » anh ngan, dang nganh, sach ngan
hong thai » cong thai, hong ha, hinh thai
hoa chat » hop chat, hoa phan
so sanh » do sanh
su sach » so 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 sanh nganh y khi đong luc ) or ( su sach thanh ((hoa chat) or (hong thai)) đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh nganh y khi đong luc ) OR ( su sach thanh ((hoa chat) OR (hong thai)) đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh nganh y khi đong luc ) or ( su sach thanh ((hoa chat) or (hong thai)) đong luc ))*.