Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, thi chieu
dung cong » dung trong
theo chu » cho chu, chao chu, theo yeu
lang qua » lang que, long qua, nang quan
lang cua » mang cua, hang cua, long cua
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan tap » phan lap, han tap, pha tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo chu)) tinh - nhanh ((lang qua) OR (lang cua)) dung cong tan phan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (theo chu)) tinh - nhanh ((lang qua) or (lang cua)) dung cong tan phan tap~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (theo chu)) tinh - nhanh ((lang qua) or (lang cua)) dung cong tan phan tap*.