Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
nang doc » nang luc
bach tuc » bach tuoc, cach thuc, sach truc
va triet » va thiet, va trien, ve triet
trang xa » trang va, trang ha, trong xa
sach ky » sac ky, sach y, sach ty
tang xa » tang ma, lang xa, tang ha
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((tang xa) OR (trang xa)) hoi. hieu vien bach tuc xa ((nang doc) or (nang noi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((tang xa) OR (trang xa)) hoi. hieu vien bach tuc xa ((nang doc) OR (nang noi)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((tang xa) OR (trang xa)) hoi. hieu vien bach tuc xa ((nang doc) or (nang noi)) va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((tang xa) OR (trang xa)) hoi. hieu vien bach tuc xa ((nang doc) or (nang noi)) va triet*.