Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
phan duc » pham duc, phan tu, phan dau
tu cach » tu cac
hang xa » hoang xa, hang va, hang ca
va hanh » van hanh, va thanh, va danh
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
tu hang » thu hang, tu hanh, tu hung
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (((te sach) OR (toc sach)))) tu hang xa hoi. hieu ve phan duc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (((te sach) OR (toc sach)))) tu hang xa hoi. hieu ve phan duc va hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (((te sach) OR (toc sach)))) tu hang xa hoi. hieu ve phan duc va hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (((te sach) OR (toc sach)))) tu hang xa hoi. hieu ve phan duc va hanh vi cuu tre*.