Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
cua dong » chua dong, cua dang, cua nong
cong tan » cong tac, cong san, cong thanh
nhanh va » hanh va, nhanh ha, thanh va
nhan va » nhan tai, nhan dan, nhan tao

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 ((cua cong) or (cua dong)) cong tan ((nhanh va) or (nhan va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - thanh trung ((cua cong) OR (cua dong)) cong tan ((nhanh va) OR (nhan va)).
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - thanh trung ((cua cong) or (cua dong)) cong tan ((nhanh va) or (nhan va))*.