Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
hang cong » dang cong, hang nong, bang cong
trung va » truong va, trang va, trung ha
cong hoc » dong hoc, cong hoa, cong coc
va hang » van hang, va nang, va lang
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 hang 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 hang cong hoc ngu cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chiet tach)) - thanh trung va hang cong hoc ngu cau*.