Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
vien cam » vien cac, vien nam, vien can
vien cao » vien cac, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
xuc van » duc van, luc van, vuc van
hanh di » hanh vi, hanh de, hang di
cua tuc » cua duc, cua tu, cua thuoc
di cua » dai cua, doi cua, de cua

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 van nang xa hoi. hieu ((vien cam) or (vien cao)) xuc van hanh di cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach van nang xa hoi. hieu ((vien cam) OR (vien cao)) xuc van hanh di cua tuc.
• Adding a wildcard symbol may retrieve word variants: tu sach van nang xa hoi. hieu ((vien cam) or (vien cao)) xuc van hanh di cua tuc*.