Perhaps you should try some spelling variations:
pham sach » pham anh, nam sach, pham hanh
sach van » sach han, sach va, bach van
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
cuu tre » cua 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: tu sach ty nang xa hoi. hieu va pham sach van hanh vi ((cuu tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu va pham sach van hanh vi ((cuu tre) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu va pham sach van hanh vi ((cuu tre) or (cua viet))*.