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

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 so gia hanh va ((su triet) or (su viet))~.
• 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 so gia hanh va ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang ma)) hoi. hieu va cham so gia hanh va ((su triet) or (su viet))*.