Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
vat hanh » van hanh, va hanh, nhat hanh
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
via cua » gia cua, gian cua, giau cua
y nang » ky nang, ly nang, v nang
bai so » dai so, tai so, hai so
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: su sach y nang cao hoi. hieu va bai so ((vat hanh) OR (vat thanh)) via cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang cao hoi. hieu va bai so ((vat hanh) OR (vat thanh)) via cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoi. hieu va bai so ((vat hanh) OR (vat thanh)) via cua te*.