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

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)) tang xa hoi. hieu va ((cau loc) OR (hau 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)) tang xa hoi. hieu va ((cau loc) OR (hau 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)) tang xa hoi. hieu va ((cau loc) OR (hau loc)) va trinh ve cau tren".
• Adding a wildcard symbol may retrieve word variants: te ((ban ky) or (sang ky)) tang xa hoi. hieu va ((cau loc) OR (hau loc)) va trinh ve cau tren*.