Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
tac dung » sach dung, xay dung, tin dung
cay phoi » cap phoi, tay hoi, cay cho
va tinh » may tinh
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
hieu ve » hieu va, hieu van
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 (tac dung)) cay phoi. hieu ve nam tu va tinh ((hai cua) OR (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((tay lang) OR (tac dung)) cay phoi. hieu ve nam tu va tinh ((hai cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tay lang) or (tac dung)) cay phoi. hieu ve nam tu va tinh ((hai cua) OR (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((tay lang) or (tac dung)) cay phoi. hieu ve nam tu va tinh ((hai cua) OR (hoi cua)) tre*.