Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nhung cau » chung cu, nhung bai, nhu cau
hang cau » hang dau, nang cao, hang va
van hanh » van thanh, ban hanh, van anh
hang ca » hang va, nang cao, hang tai
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi
qua ca » qua cac, qua cua, qua cai
ca duc » cao duc, cua duc, ca dua
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty ((((hang cau) OR (hang ca))) or (nhung cau)) hoi. hieu qua ca duc van hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty ((((hang cau) OR (hang ca))) OR (nhung cau)) hoi. hieu qua ca duc van hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty ((((hang cau) OR (hang ca))) or (nhung cau)) hoi. hieu qua ca duc van hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty ((((hang cau) OR (hang ca))) or (nhung cau)) hoi. hieu qua ca duc van hanh va cua te*.