Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
trinh cong » trinh dung
sach nganh » sach ngan, sach tranh, cac nganh
cong thai » cong hai, hong thai, cong thanh
hinh thai » sinh thai, tinh thai, dinh thi
cong khi » khong khi, co khi, cong ha
thu sach » tu sach, thuat sach, thuoc sach
su sach » so sach, vu sach

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

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