Perhaps you should try some spelling variations:
hanh vinh » thanh vinh, khanh vinh, hanh tinh
vinh cuu » dinh cuu, sinh cua, dinh cu
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
hieu ve » hieu van
ky tang » ky nang, ky dang, kho tang
y tang » 6 tang, 7 tang, 5 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y tang) OR (ky tang)) van hoa. ((hieu ve) or (hieu va)) cam duc van hanh vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y tang) OR (ky tang)) van hoa. ((hieu ve) OR (hieu va)) cam duc van hanh vinh cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y tang) OR (ky tang)) van hoa. ((hieu ve) or (hieu va)) cam duc van hanh vinh cuu tre*".