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