Perhaps you should try some spelling variations:
hanh hanh » hanh han, xanh hanh, nhanh thanh
hoc sach » hoc sinh, hoc cac, hoc anh
duc hanh » duc thanh, duc anh, du hanh
va triet » va thiet, va trien, ve triet
ty nang » ty xang, ty hang, ly nang
van cao » van bao, van hao, van cau
vi va » vi van, vai va, vu va

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

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