Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
ly hang » ly quang
yu hang » yu zhang, yu pang, thu hang
yu wang » yun wang, yi wang, yu pang
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 ((ly hang) or (((yu hang) OR (yu wang)))) 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 ((ly hang) OR (((yu hang) OR (yu wang)))) 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 ((ly hang) or (((yu hang) OR (yu wang)))) cau hoi. hieu qua ca duc van hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((ly hang) or (((yu hang) OR (yu wang)))) cau hoi. hieu qua ca duc van hanh va cua te*.