Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
cua tre » cua te, cuu tre, cua triet
cach tu » cach thuc
lang xa » lang ha, dang xay, lang van
va cua » va chua, via cua, ca cua
van am » van nam, van lam, van dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((cach tu) OR (sach thu)) lang xa hoi. hieu van am thuc ((va dinh) OR (va tinh)) va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((cach tu) OR (sach thu)) lang xa hoi. hieu van am thuc ((va dinh) OR (va tinh)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((cach tu) OR (sach thu)) lang xa hoi. hieu van am thuc ((va dinh) OR (va tinh)) va cua tre*.