Perhaps you should try some spelling variations:
thu xac » thau xay
va hanh » van hanh, va thanh, ban hanh
han cua » hang cua, nhan cua, than cua
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
xac ky » cac ky, sac ky, bac ky
cac lo » cac lop, cac co, cac bo

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu xac ky nang xa hoi. ((hieu va) or (hieu qua)) cac lo ((va hanh) OR (va danh)) han cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu xac ky nang xa hoi. ((hieu va) OR (hieu qua)) cac lo ((va hanh) OR (va danh)) han cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu xac ky nang xa hoi. ((hieu va) or (hieu qua)) cac lo ((va hanh) OR (va danh)) han cua tre".
• Adding a wildcard symbol may retrieve word variants: thu xac ky nang xa hoi. ((hieu va) or (hieu qua)) cac lo ((va hanh) OR (va danh)) han cua tre*.