Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
truong cao » truong dai
hoc thien » hoc hien, hoc thieu, hoc thiet
trung cap » trung tam
trong san » trong cac, cong san, dong san
san khoan » san khoa, toan khoan, cac khoan
khoan cam » khoa cam, khoan va, phan 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 thien hach - thanh ((trung cap) or (truong cao)) dung trong san khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - thanh ((trung cap) OR (truong cao)) dung trong san khoan cam.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - thanh ((trung cap) or (truong cao)) dung trong san khoan cam*.