Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
cham duc » pham duc, cham soc, pham duy
dua tren » dung tren
cua tre » cua te, cua triet, cua thep
sach ty » sach y, sach tu, sach thu
so sach » so sanh, bo sach, co sach
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cau tren, cau treo

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 ty nang xa hoi. hieu vu cham duc va doanh tai ((((cua tre) OR (dua tren))) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu vu cham duc va doanh tai ((((cua tre) OR (dua tren))) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang xa hoi. hieu vu cham duc va doanh tai ((((cua tre) OR (dua tren))) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu vu cham duc va doanh tai ((((cua tre) OR (dua tren))) or (cuu tre))*.