Perhaps you should try some spelling variations:
van nhan » van phan, van thanh, danh nhan
nhan luc » nang luc
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
tang xa » trang xa, tang ma, lang xa
sang ky » sang kyo, dang ky, tang ky
cau tra » ca tra, cau ra, cau truc
san ky » van ky, dan ky, ban ky
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: thu ((san ky) or (sang ky)) tang xa hoi. hieu van nhan luc ((va danh) OR (va hanh)) di cau tra~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((san ky) OR (sang ky)) tang xa hoi. hieu van nhan luc ((va danh) OR (va hanh)) di cau tra.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((san ky) or (sang ky)) tang xa hoi. hieu van nhan luc ((va danh) OR (va hanh)) di cau tra".
• Adding a wildcard symbol may retrieve word variants: thu ((san ky) or (sang ky)) tang xa hoi. hieu van nhan luc ((va danh) OR (va hanh)) di cau tra*.