Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cham tuc » nham thuc, pham thuc, tham thuc
va triet » va trien, ve triet, cua triet
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
thiet » thieu

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

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