Perhaps you should try some spelling variations:
phan duc » pham duc, phan tu, phan dau
va thanh » gia thanh, ban thanh, va tinh
sach thu » sach thue, sach thieu, sach tham
chieu ke » hieu ky, hieu ve, hieu kem
va danh » va dinh, va dan, va hanh
ke phan » ve phan, kenh phan, ke thang
sach ty » sach y, sach tu, xach tay
nang co » nang cao, nang doc, nang noi
su tien » su kien, su hien, tu tieng
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ty) OR (sach thu)) nang co hoc. chieu ke phan duc ((va danh) or (va thanh)) vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ty) OR (sach thu)) nang co hoc. chieu ke phan duc ((va danh) OR (va thanh)) vi su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ty) OR (sach thu)) nang co hoc. chieu ke phan duc ((va danh) or (va thanh)) vi su tien".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ty) OR (sach thu)) nang co hoc. chieu ke phan duc ((va danh) or (va thanh)) vi su tien*.