Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
hanh di » hanh vi, hanh de, hang di
cam duc » cam xuc, cao duc, pham duc
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

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