Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va
hanh di » hanh vi, hanh de, hang di
cau tre » cau tren, cau treo, cau tra
di cau » da cau, diem cau

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 ly nang x ho. ((hieu va) or (hieu qua)) am (thuc or thu) van hanh di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly nang x ho. ((hieu va) OR (hieu qua)) am (thuc OR thu) van hanh di cau tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ly nang x ho. ((hieu va) or (hieu qua)) am (thuc or thu) van hanh di cau tre*.