Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hanh tai » thanh tai, hang tai, han tai
tu sach » su sach, te sach, tu cach
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
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: ((tu sach) OR (thu sach)) ty lang xa hoi. lieu va cam duc van ((thanh san) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty lang xa hoi. lieu va cam duc van ((thanh san) OR (hanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty lang xa hoi. lieu va cam duc van ((thanh san) or (hanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty lang xa hoi. lieu va cam duc van ((thanh san) or (hanh tai)) cua tre*.