Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong canh » phuong anh, phuong cach, phong canh
thieu sach » chieu sach, thien hach, theo sach
cua phuong » cuu phuong, cuc phuong, luan phuong
hieu cach » hieu cac, chieu sach, hieu ca
trung cua » truong cua, trung tuan, trung cap
chinh cau » chinh chau, chinh ca, chinh can
canh dan » canh van, sanh dan, thanh dan
chan cau » phan cau, can cau, nhanh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) OR (hieu cach)) - thanh trung cua phuong canh dan ((chan cau) or (chinh cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - thanh trung cua phuong canh dan ((chan cau) OR (chinh cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - thanh trung cua phuong canh dan ((chan cau) or (chinh cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (hieu cach)) - thanh trung cua phuong canh dan ((chan cau) or (chinh cau))*.