Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thien hach » hien hanh
thanh tung » thanh cong
dung cong » dung trong
nhanh cau » nhanh cay, thanh chau, nhanh ha
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
hanh cac » hang cac, hanh cat, nhanh cay

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) or (thien thanh)) - thanh tung cua dung cong tac ((hanh cac) or (nhanh cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (thien thanh)) - thanh tung cua dung cong tac ((hanh cac) OR (nhanh cau)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (thien thanh)) - thanh tung cua dung cong tac ((hanh cac) or (nhanh cau))*.