Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
ky lang » ky dang, ky tang, tay lang
van lam » van nam
lam loc » lam duoc, lam ngoc
ha hoi » hoa hoi, ha noi, xa hoi
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: so sach ((ky lang) OR (ky nang)) ha hoi. hieu van lam loc ((van hanh) or (ban hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky lang) OR (ky nang)) ha hoi. hieu van lam loc ((van hanh) OR (ban hanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ky lang) OR (ky nang)) ha hoi. hieu van lam loc ((van hanh) or (ban hanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ((ky lang) OR (ky nang)) ha hoi. hieu van lam loc ((van hanh) or (ban hanh)) vi cua te*.