Perhaps you should try some spelling variations:
thanh trung » thanh tung
hoc nghien » hoc hien
hoc nhiet » hoc hien, hoc viet, hoc thieu
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cap » truong cao, trung tam
cap dung » ap dung, cao dung, chan dung
trong do » trong doi, trong dao, trong co
do van » dao van, vo van, so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((hoc nhiet) or (hoc nghien))) or (hoc thiet)) tach - thanh trung cap dung trong do van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((hoc nhiet) OR (hoc nghien))) OR (hoc thiet)) tach - thanh trung cap dung trong do van ban.
• Adding a wildcard symbol may retrieve word variants: ((((hoc nhiet) or (hoc nghien))) or (hoc thiet)) tach - thanh trung cap dung trong do van ban*.