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 » thong cong, hang cong, nhung don
hieu cach » hieu cac, hieu ca, biet cach
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
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 ((hieu cach) or (chieu sach)) - manh trung cua ((nhung cong) OR (dung cong)) tan thai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (chieu sach)) - manh trung cua ((nhung cong) OR (dung cong)) tan thai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu cach) or (chieu sach)) - manh trung cua ((nhung cong) OR (dung cong)) tan thai cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) or (chieu sach)) - manh trung cua ((nhung cong) OR (dung cong)) tan thai cao*.