Perhaps you should try some spelling variations:
tay dang » tay dong, tay lang, tay tang
lanh hai » manh hai, thanh hai, lang chai
tay dung » xay dung, tac dung, tay nung
cay phoi » cap phoi, tay hoi, cay cho
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
va lanh » va lang, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai

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 ((tay dang) or (tay dung)) cay phoi. hieu ((ve cam) OR (va cam)) duc va lanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tay dang) OR (tay dung)) cay phoi. hieu ((ve cam) OR (va cam)) duc va lanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tay dang) or (tay dung)) cay phoi. hieu ((ve cam) OR (va cam)) duc va lanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tay dang) or (tay dung)) cay phoi. hieu ((ve cam) OR (va cam)) duc va lanh hai cua tre*.