Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
hieu va » hieu qua
va hanh » van hanh, va thanh, va danh
hanh ca » hanh cac, hanh cat, hanh cua
y nang » ky nang, ly nang, v nang
cac tu » cac thu, cach tu, cac du
ca cua » co 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: vu sach y nang ((le hoi) or (ma hoa)). ((hieu va) or (lieu va)) cac tu va hanh ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ((le hoi) OR (ma hoa)). ((hieu va) OR (lieu va)) cac tu va hanh ca cua te.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ((le hoi) or (ma hoa)). ((hieu va) or (lieu va)) cac tu va hanh ca cua te*.