Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
sach thu » sach thieu, sach tham, cach thuc
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
lai cua » hai cua, lai chau, thai cua
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: su ((sach thu) OR (sach thue)) nang xa hoi. hieu va cam duc va danh ((lai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sach thue)) nang xa hoi. hieu va cam duc va danh ((lai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach thu) OR (sach thue)) nang xa hoi. hieu va cam duc va danh ((lai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) OR (sach thue)) nang xa hoi. hieu va cam duc va danh ((lai cua) or (dai cua)) tre*.