Perhaps you should try some spelling variations:
tinh thai » sinh thai, tinh toan, tinh chat
thu sach » tu sach, thuat sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
tay dung » xay dung, tac dung, tay nung
cay phoi » cap phoi, tay hoi, cay cho
tinh hai » tinh chat, trinh han, thanh hai
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nam tu » nam thu, nam thuc
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((tay lang) or (tay dung)) cay phoi. hieu ve nam tu va ((tinh hai) OR (tinh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((tay lang) OR (tay dung)) cay phoi. hieu ve nam tu va ((tinh hai) OR (tinh thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tay lang) or (tay dung)) cay phoi. hieu ve nam tu va ((tinh hai) OR (tinh thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((tay lang) or (tay dung)) cay phoi. hieu ve nam tu va ((tinh hai) OR (tinh thai)) cua tre*.