Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc 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
qua hai » qua hoat
hai duc » hoai duc, mai duc, ha duc
va hanh » van hanh, va thanh, va danh
cua cu » cua chu, cua cau, cua co
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang xa hoi. hieu qua hai duc va hanh vi ((cua cu) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. hieu qua hai duc va hanh vi ((cua cu) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu qua hai duc va hanh vi ((cua cu) or (cua su))*.