Perhaps you should try some spelling variations:
thong huong » thong thuong, thong duong, thong thong
den thanh » de thanh, dinh thanh, dong thanh
hien hanh » dieu hanh
thang qua » thong qua, thang cua, thanh qua
thang mua » thang cua, than cua, thang va
dan chan » dan gian, dan ca, van chat
chan cao » chan cho, chat cao, chay 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 ((den thanh) or (hien hanh)) - thanh ((thang qua) OR (thang mua)) thong huong dan chan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((den thanh) OR (hien hanh)) - thanh ((thang qua) OR (thang mua)) thong huong dan chan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((den thanh) or (hien hanh)) - thanh ((thang qua) OR (thang mua)) thong huong dan chan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((den thanh) or (hien hanh)) - thanh ((thang qua) OR (thang mua)) thong huong dan chan cao*.