Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cam duc » cam xuc, cao duc, pham duc
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
tu san » thu san, tu ban, vu san
tu can » tu ban, tu cac, thu canh
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu san) OR (tu can)) ky nang xa hoi. ((hieu va) or (lieu va)) cam duc va tinh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu can)) ky nang xa hoi. ((hieu va) OR (lieu va)) cam duc va tinh di cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) OR (tu can)) ky nang xa hoi. ((hieu va) or (lieu va)) cam duc va tinh di cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu san) OR (tu can)) ky nang xa hoi. ((hieu va) or (lieu va)) cam duc va tinh di cau tren*.