Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
theo sach » thuoc sach, te sach, theo lich
trung cua » truong cua, trung tuan, trung cap
tang tai » hang tai, dung tai, sang tao
tai cao » thai cao, tao cao, tai sao

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 trung cua ((nhung cong) OR (thong cong)) tang tai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (chieu sach)) - manh trung cua ((nhung cong) OR (thong cong)) tang tai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((theo sach) or (chieu sach)) - manh trung cua ((nhung cong) OR (thong cong)) tang tai cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (chieu sach)) - manh trung cua ((nhung cong) OR (thong cong)) tang tai cao*.