Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
van nang » van quang, van ban, van dong
cong hoc » dong hoc, cong hoa, cong coc
va nang » da nang, cam nang, kha nang
hoc ngu » hoc nga, hoc nguoi, hoc nghe
ngu cau » ngu ca, nhu cau, ngu cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (chiet tach)) - thanh trung ((va nang) OR (van nang)) cong hoc ngu cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chiet tach)) - thanh trung ((va nang) OR (van nang)) cong hoc ngu cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (chiet tach)) - thanh trung ((va nang) OR (van nang)) cong hoc ngu cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chiet tach)) - thanh trung ((va nang) OR (van nang)) cong hoc ngu cau*.