Perhaps you should try some spelling variations:
toan cua » than cua, tan cua, doanh cua
van tinh » van thinh, van minh, ban tinh
cham duc » pham duc, cham soc, pham duy
duc van » duc va, duc tan, duc manh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
dai hoi » dai hoc, dai hai, dai moi
sach ky » sac ky, sach y, sach kem
dau hoi » cau hoi, dan hoi, dau noi
sach ty » sach y, sach tu, sach thu

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 ky) or (sach ty)) nang ((dau hoi) or (dai hoi)). hieu ve cham duc van tinh toan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang ((dau hoi) OR (dai hoi)). hieu ve cham duc van tinh toan cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang ((dau hoi) or (dai hoi)). hieu ve cham duc van tinh toan cua tre*.