Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
ly hang » ly quang
yu hang » yu zhang, yu pang, yu wang
va cua » va chua, via cua, ca cua
qua ca » qua cac, qua cua, qua cai
ca duc » cao duc, cua duc, ca dua
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 ((ly hang) or (yu hang)) cau hoi. hieu qua ca duc ((van hanh) OR (van thanh)) va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((ly hang) OR (yu hang)) cau hoi. hieu qua ca duc ((van hanh) OR (van thanh)) va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((ly hang) or (yu hang)) cau hoi. hieu qua ca duc ((van hanh) OR (van thanh)) va cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((ly hang) or (yu hang)) cau hoi. hieu qua ca duc ((van hanh) OR (van thanh)) va cua te*.