Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
thu sac » thu sach, thu san, thu xac
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
duoc va » nuoc va, duc va, duoc ma
hanh di » hanh de, hang di, danh di
sac ky » cac ky, sai ky
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: thu sac ky nang xa hoi. ((hieu va) or (hieu van)) tao duoc va ((hanh di) OR (hanh vi)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang xa hoi. ((hieu va) OR (hieu van)) tao duoc va ((hanh di) OR (hanh vi)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang xa hoi. ((hieu va) or (hieu van)) tao duoc va ((hanh di) OR (hanh vi)) cua tu".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang xa hoi. ((hieu va) or (hieu van)) tao duoc va ((hanh di) OR (hanh vi)) cua tu*.