Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, vu khach
su sach » so sach
va dinh » van dinh, va kinh, va tinh
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (su sach)) ky nang x ho. lieu va cam tu ((va thanh) or (va dinh)) ki su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky nang x ho. lieu va cam tu ((va thanh) OR (va dinh)) ki su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) ky nang x ho. lieu va cam tu ((va thanh) or (va dinh)) ki su tien".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) ky nang x ho. lieu va cam tu ((va thanh) or (va dinh)) ki su tien*.