Perhaps you should try some spelling variations:
thanh ho » thanh pho, thanh hoa, thanh hoc
doc sach » hoc sach, toc sach, nuoc sach
sach ky » sac ky, sach y, sach ty
duc gia » quoc gia
cua tuc » cua duc, cua tu, cua thuoc
ve cai » va cai, ve cac, ve tai
va cam » va cham, va cac, va cao
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky nang x ho. hieu ((ve cai) or (va cam)) duc gia thanh ho ((cua te) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang x ho. hieu ((ve cai) OR (va cam)) duc gia thanh ho ((cua te) OR (cua tuc)).
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang x ho. hieu ((ve cai) or (va cam)) duc gia thanh ho ((cua te) or (cua tuc))*.