Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
trinh ve » trinh he, trinh va, trinh vi
va trinh » van trinh, va tinh, lap trinh
dang ky » dang y, dan ky, dong ky
tang xa » trang xa, tang ma, lang xa
sang ky » sang kyo, tang ky, bang ky
van cau » van dau, van hau, van chat
cau loc » hau loc, cau hoc, cau luc
ban ky » van ky, dan ky
loc va » hoc va, luc va
ve cau » ke cau, va cau, ve cac

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

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