Perhaps you should try some spelling variations:
thanh trung » thanh tung
thong lanh » thong danh, tuong lanh, thong thanh
hieu cach » hieu cac, chieu sach, hieu ca
cua khong » cua phuong, cua thuong, cua cong
hua khong » hoa khong, hoac khong, phuc khong
lanh tuan » anh tuan, manh tuan, lanh xuan
doc hieu » toc thieu, hoc thieu, hoc hien
tuan cu » tuan tu, quan cua, tuan thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu cach - thanh trung ((cua khong) or (hua khong)) thong lanh tuan cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu cach - thanh trung ((cua khong) OR (hua khong)) thong lanh tuan cu.
• Adding a wildcard symbol may retrieve word variants: doc hieu cach - thanh trung ((cua khong) or (hua khong)) thong lanh tuan cu*.