Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien bach » vien bach, hien hanh, dien sach
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
cuu tre » cua tre, cau tren, cau treo
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 hoi. bieu ((hien bach) or (thien hach)) ((xuc van) OR (vuc van)) hang va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. bieu ((hien bach) OR (thien hach)) ((xuc van) OR (vuc van)) hang va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. bieu ((hien bach) or (thien hach)) ((xuc van) OR (vuc van)) hang va cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. bieu ((hien bach) or (thien hach)) ((xuc van) OR (vuc van)) hang va cuu tre*.