Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung tuong » nhung huong, nhung phuong, hung vuong
hieu quang » thieu quang, hieu quan, hieu qua
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu van, biet lang
tuong dan » huong dan, tung dan, xuong dan
trung ve » trung va, trung vu, trung vi
ve nhung » va nhung, tu nhung
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((nhieu tang) or (((hieu lang) OR (hieu quang)))) - thanh trung ve nhung tuong dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((nhieu tang) OR (((hieu lang) OR (hieu quang)))) - thanh trung ve nhung tuong dan than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((nhieu tang) or (((hieu lang) OR (hieu quang)))) - thanh trung ve nhung tuong dan than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((nhieu tang) or (((hieu lang) OR (hieu quang)))) - thanh trung ve nhung tuong dan than cap*.