Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thien chanh » thien chinh, hien hanh, tien thanh
truong cam » truong ca, truong ham, truong lam
truong cao » truong dai
nhung cong » dung cong, thong cong, hang cong
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (thien chanh)) - thanh ((truong cam) OR (truong cao)) nhung cong tam toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (thien chanh)) - thanh ((truong cam) OR (truong cao)) nhung cong tam toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien thanh) or (thien chanh)) - thanh ((truong cam) OR (truong cao)) nhung cong tam toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (thien chanh)) - thanh ((truong cam) OR (truong cao)) nhung cong tam toan tap*.