Perhaps you should try some spelling variations:
van hang » van khang, van hoang, van thang
tu sach » thu sach, su sach, te sach
vien va » dien va, vien da, tien va
sach ky » sac ky, sach y, sach ty
viec va » viec cua, viec lam
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
lo van » le van, vo van, so van
va cuu » va cau, va chu, va huu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) or (nang ma)) hoi. hieu ((viec va) OR (vien va)) lo van hang va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((viec va) OR (vien va)) lo van hang va cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (nang ma)) hoi. hieu ((viec va) OR (vien va)) lo van hang va cuu tre*".