Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
theo sach » thuoc sach, te sach, theo lich
manh tung » manh hung, thanh tung
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
tung cua » trung cua, tuong cua, dung cua
tan thai » tay thai, ban thai, tan tai
thai cao » tai cao, thoai cac, thuat cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((theo sach) or (chieu sach)) - manh tung cua ((hang cong) OR (dang cong)) tan thai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (chieu sach)) - manh tung cua ((hang cong) OR (dang cong)) tan thai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((theo sach) or (chieu sach)) - manh tung cua ((hang cong) OR (dang cong)) tan thai cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (chieu sach)) - manh tung cua ((hang cong) OR (dang cong)) tan thai cao*.