Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
hien cach » hien cac, thien hach, khien canh
hieu cach » hieu cac, chieu sach, hieu ca
trung cua » truong cua, trung tuan, trung cap
dang cong » dung cong
tan nhanh » tai nhanh, tan nhan, tan thanh
nhanh ha » thanh hoa, thanh hai, khanh hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien cach) OR (hieu cach)) - thanh trung cua ((nhung cong) or (dang cong)) tan nhanh ha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien cach) OR (hieu cach)) - thanh trung cua ((nhung cong) OR (dang cong)) tan nhanh ha.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien cach) OR (hieu cach)) - thanh trung cua ((nhung cong) or (dang cong)) tan nhanh ha".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien cach) OR (hieu cach)) - thanh trung cua ((nhung cong) or (dang cong)) tan nhanh ha*.