Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hanh hai » nhanh hai, hang hai, hanh tai
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
su sac » su sach, su cac
ve cac » va cac, vien cac
su xac » pu xac, su cac
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: ((su sac) OR (su xac)) ky nang xa hoi. hieu ve cac duc van ((hanh hai) or (thanh hai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky nang xa hoi. hieu ve cac duc van ((hanh hai) OR (thanh hai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su xac)) ky nang xa hoi. hieu ve cac duc van ((hanh hai) or (thanh hai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su xac)) ky nang xa hoi. hieu ve cac duc van ((hanh hai) or (thanh hai)) cua tu*.