Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » su triet, va triet
hanh tai » thanh tai, hang tai, han tai
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
lao va » tao va, cao va, dao va
bao va » bao ve, tao va, ban va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang xa hoi. hieu va cac ((lao va) OR (bao va)) hanh tai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang xa hoi. hieu va cac ((lao va) OR (bao va)) hanh tai ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang xa hoi. hieu va cac ((lao va) OR (bao va)) hanh tai ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang xa hoi. hieu va cac ((lao va) OR (bao va)) hanh tai ((cua triet) or (cua viet))*.