Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
nhung dung » phuong dung, ung dung, thong dung
hoc thien » hoc hien, hoc thieu, hoc thiet
trung cap » truong cao
dung manh » duong manh, dung danh, hung manh
toan cao » toan tap
toan ban » van 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 - thanh ((trung tam) or (trung cap)) nhung dung manh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien thanh - thanh ((trung tam) OR (trung cap)) nhung dung manh ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thien thanh - thanh ((trung tam) or (trung cap)) nhung dung manh ((toan cao) or (toan ban))*.