Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
tang van » dang van, hoang van, trong van
toc sach » hoc sach, doc sach, thuoc sach
xa trinh » xa tinh, va trinh, xuan trinh
toan cua » than cua, tan cua, doanh cua
tu sach » thu sach, su sach, te sach
ky tang » ky nang, ky dang, kho tang
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (toc sach)) ky tang van hoi. hieu ve cac tuc xa trinh toan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky tang van hoi. hieu ve cac tuc xa trinh toan cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky tang van hoi. hieu ve cac tuc xa trinh toan cua tre*.