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