Perhaps you should try some spelling variations:
trung long » truong long, trung uong, trong long
hanh mang » nhanh mang, hanh trang, nhanh lang
dat trung » dac trung, dat trong, dai trung
long span » cong san, dong san, nong san
thanh lap » thanh san, thanh hai, thanh van
hoc kien » hoc hien, hoc vien, hoa kien
kien mac » dien mao, tien mai, kien ha
mang dat » mang dau, hoang dat, hang dau
phan lap » phan dau

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 - hanh mang dat trung long span ((phan lap) or (thanh lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc kien mac - hanh mang dat trung long span ((phan lap) OR (thanh lap))*.