Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dieu cua » dieu tra
thuc day » thuc dan
xang cao » nang cao, lang cao, quang cao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
sach ty » sach y, sach tu, sach thu
cao hoi » cau hoi, co hoi, cao hoc
le cua » ly cua

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 ty xang cao hoi. hieu ve pham ((thuc day) or (thuc vat)) hang ((le cua) or (dieu cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang cao hoi. hieu ve pham ((thuc day) OR (thuc vat)) hang ((le cua) OR (dieu cua)) te.
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang cao hoi. hieu ve pham ((thuc day) or (thuc vat)) hang ((le cua) or (dieu cua)) te*.