Perhaps you should try some spelling variations:
trong long » trong luong, truong long, trong cong
long span » cong san, dong san, nong san
span phan » san phan, san pham, luan phan
kien mac » dien mao, tien mai, kien ha
gian dan » gian lang
ca trong » cay trong, cad trong, co trong
phan lap » phan dau
anh dan » anh dang, anh danh, canh dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((kien mac) or (gian dan)) - anh dan ca trong long span phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((kien mac) OR (gian dan)) - anh dan ca trong long span phan lap*.