Perhaps you should try some spelling variations:
vien cao » vien cac, vien dai, vien da
sach han » sach tham, sach danh, sach nang
van hanh » van thanh, ban hanh, van anh
vien cam » vien cac, vien nam, vien can
sach van » sach va, bach van, cach van
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
cua tuc » cua duc, cua tu, cua thuoc
nang xa » nang x, lang xa, nang ma
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) OR (sach han)) 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) OR (sach han)) 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 van) OR (sach han)) 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) OR (sach han)) nang xa hoi. hieu ((vien cam) or (vien cao)) xuc van hanh di cua tuc*.