Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
chat huu » pham huu
chat xuc » cam xuc, chao xu, chat cua
thu san » thuy san, thu ban, phu san
hieu su » hieu sau, tieu su, hieu so
dai hoi » dai hoc, dai hai, dai moi
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu san ((ky sang) or (ky tang)) dai hoi. hieu su ((chat xuc) OR (chat huu)) van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ((ky sang) OR (ky tang)) dai hoi. hieu su ((chat xuc) OR (chat huu)) van hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu san ((ky sang) or (ky tang)) dai hoi. hieu su ((chat xuc) OR (chat huu)) van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: thu san ((ky sang) or (ky tang)) dai hoi. hieu su ((chat xuc) OR (chat huu)) van hanh vi cua te*.