Perhaps you should try some spelling variations:
nhiet tach » chiet tach
hanh trung » thanh trung, hanh trang, manh trung
trung tuan » trung thanh, trung tam, tran tuan
hoc nhiet » hoc thiet, hoc nghien, hoc hien
tuan dang » tran dang, tuan bang, tuan dung
nong van » song van, nong san, tong van
nong dan » cong dan, nong san, nguong dan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nhiet tach - hanh trung tuan dang ((nong van) OR (nong dan)) ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nhiet tach - hanh trung tuan dang ((nong van) OR (nong dan)) ((toan tap) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nhiet tach - hanh trung tuan dang ((nong van) OR (nong dan)) ((toan tap) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc nhiet tach - hanh trung tuan dang ((nong van) OR (nong dan)) ((toan tap) or (toan ban))*.