Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
duc manh » suc manh, duc anh, duc minh
sach thu » sach thue, sach thieu, sach tham
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
cam duc » cam xuc, cao duc, pham duc
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao

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 ty) or (sach thu)) nang xa hoi. hieu va cam duc manh hanh ((lai cua) OR (hai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang xa hoi. hieu va cam duc manh hanh ((lai cua) OR (hai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach thu)) nang xa hoi. hieu va cam duc manh hanh ((lai cua) OR (hai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang xa hoi. hieu va cam duc manh hanh ((lai cua) OR (hai cua)) triet*.