Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh tri » thanh tri, hanh tai, hanh trinh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van lam » van nam
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu van lam ((xuc va) OR (luc va)) hanh tri ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu van lam ((xuc va) OR (luc va)) hanh tri ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu van lam ((xuc va) OR (luc va)) hanh tri ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu van lam ((xuc va) OR (luc va)) hanh tri ((cua te) or (cua tu))*.