Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
soc giao » hoc giao, so giao, nuoc giao
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
va cham » va chat, va tham
nang xa » nang x, lang xa, mang xa
hanh va » hanh vi
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang xa) or (nang ma)) hoi. hieu va cham soc giao ((hanh va) OR (hang va)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang ma)) hoi. hieu va cham soc giao ((hanh va) OR (hang va)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (nang ma)) hoi. hieu va cham soc giao ((hanh va) OR (hang va)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang ma)) hoi. hieu va cham soc giao ((hanh va) OR (hang va)) su triet*.