Perhaps you should try some spelling variations:
truong cua » truong ca, truong quan, truong cao
hien tinh » khien tinh, thien tinh, bien tinh
trung cua » trung tuan, trung cap, dung cua
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan khan » tan khang, tan nhan, toan khoan
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien tinh - hanh ((trung cua) or (truong cua)) dung cong tan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tinh - hanh ((trung cua) OR (truong cua)) dung cong tan khan cap.
• Adding a wildcard symbol may retrieve word variants: hoc hien tinh - hanh ((trung cua) or (truong cua)) dung cong tan khan cap*.