Perhaps you should try some spelling variations:
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
sai ky » sac ky
va cam » va cham, va cac, va cao
va dao » ca dao
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: tu ((sach ty) or (sai ky)) nang xa hoi. hieu va cam xuc ((va hanh) or (va dao)) dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sai ky)) nang xa hoi. hieu va cam xuc ((va hanh) OR (va dao)) dai cua tu.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sai ky)) nang xa hoi. hieu va cam xuc ((va hanh) or (va dao)) dai cua tu*.