Perhaps you should try some spelling variations:
phung cong » nhung cong, phong cong, nhung chong
chieu sach » chinh sach, chiet tach, chieu sang
theo sach » thuoc sach, te sach, theo lich
manh tung » manh hung, thanh tung
tung tuan » trung tuan, hung tuan, quang tuan
hung cong » nhung cong, hung cuong, dung cong
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 tuan ((hung cong) OR (phung 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 tuan ((hung cong) OR (phung 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 tuan ((hung cong) OR (phung cong)) tan thai cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (chieu sach)) - manh tung tuan ((hung cong) OR (phung cong)) tan thai cao*.