Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
dang van » hoang van, hang va
dang xay » van xay
trinh tu » trinh ky, trinh do
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao

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 ty ((dang van) or (dang xay)) hoi. hieu va cam xuc va ((trinh tu) or (trinh toan)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((dang van) OR (dang xay)) hoi. hieu va cam xuc va ((trinh tu) OR (trinh toan)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((dang van) or (dang xay)) hoi. hieu va cam xuc va ((trinh tu) or (trinh toan)) cua tre*.