Perhaps you should try some spelling variations:
va trinh » van trinh, lap trinh, qua trinh
te sach » toc sach
han cua » hang cua, nhan cua, than cua
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
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: te sach tu ((hang va) or (lang xa)) hoi. hieu va cam xuc ((va trinh) or (va tinh)) han cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((hang va) OR (lang xa)) hoi. hieu va cam xuc ((va trinh) OR (va tinh)) han cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu ((hang va) or (lang xa)) hoi. hieu va cam xuc ((va trinh) or (va tinh)) han cua tre*.