Perhaps you should try some spelling variations:
hien thanh » thien thanh, hien hanh, dien thanh
tien thanh » tien thinh, tran thanh, den thanh
chung cach » phuong cach, phong cach, cung cac
dan chung » doanh chung, van chuong, dung chung
cua rung » cua trung, cua rang, cua truong
qua dung » quang dung, su dung, qua song

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien thanh) OR (tien thanh)) - canh tranh ((cua rung) or (qua dung)) huong dan chung cach~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien thanh) OR (tien thanh)) - canh tranh ((cua rung) OR (qua dung)) huong dan chung cach.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien thanh) OR (tien thanh)) - canh tranh ((cua rung) or (qua dung)) huong dan chung cach".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien thanh) OR (tien thanh)) - canh tranh ((cua rung) or (qua dung)) huong dan chung cach*.