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