Perhaps you should try some spelling variations:
cham lao » chai lao, cham lai, cham vao
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
sach ly » sach y, sach lo, sach hay
nang co » nang cao, nang doc, nang noi
sach ty » sach y, sach tu, sach thu
co hoi » co hoc, co loi
lao va » tao va, cao va, bao va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ly) OR (sach ty)) nang co hoi. hieu vu cham lao va hanh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ly) OR (sach ty)) nang co hoi. hieu vu cham lao va hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ly) OR (sach ty)) nang co hoi. hieu vu cham lao va hanh ((vai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ly) OR (sach ty)) nang co hoi. hieu vu cham lao va hanh ((vai cua) or (hai cua)) tre*.