Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh trung » thanh trung, hanh trang, manh trung
tong thong » thong thong, dong thong, cong thong
hoc thien » hoc hien, hoc thieu, hoc thiet
trung cua » truong cua, trung tuan, trung cap
cua tong » cua cong, cua dong, cua nong
toan ban » van ban
tan can » toan can, tan van, ban can

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 - hanh trung cua tong thong ((tan can) or (toan ban)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh trung cua tong thong ((tan can) OR (toan ban)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh trung cua tong thong ((tan can) or (toan ban)) cau*.