Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
tan hanh » tan thanh, tang hanh, toan hanh
sang ky » sang kyo, dang ky, tang ky
nang xa » nang x, lang xa, nang ma
doi cua » dai cua, hoi cua, dong cua
san ky » van ky, dan ky, ban ky
di cua » dai cua, de cua, do cua

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 ky) OR (sang ky)) nang xa hoi. hieu van pham duc tan hanh ((di cua) or (doi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) nang xa hoi. hieu van pham duc tan hanh ((di cua) OR (doi cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (sang ky)) nang xa hoi. hieu van pham duc tan hanh ((di cua) or (doi cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (sang ky)) nang xa hoi. hieu van pham duc tan hanh ((di cua) or (doi cua)) triet*.