Perhaps you should try some spelling variations:
va trinh » van trinh, va tinh, lap trinh
vien cac » vien bach, vien dai, vien da
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
ve cac » va cac
te san » te ban, ke san, ta san
luc va » duc va, tuc va, loc va
tu san » thu san, tu ban, tu can
va cam » va cham, va cac, va cao

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

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