Perhaps you should try some spelling variations:
vien cam » vien cac, vien nam, vien can
van hanh » van thanh, ban hanh, van anh
vien cao » vien cac, vien dai, vien da
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
vu nang » vuc nang, va nang, vu dang
cua tuc » cua duc, cua tu, cua thuoc
v nang » va nang, van nang, voi nang
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 ((v nang) OR (vu 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 ((v nang) OR (vu nang)) xa hoi. hieu ((vien cam) OR (vien cao)) xuc van hanh di cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((v nang) OR (vu 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 ((v nang) OR (vu nang)) xa hoi. hieu ((vien cam) or (vien cao)) xuc van hanh di cua tuc*.