Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
thue va » thuc va, thuyet va, thuc vat
y nang » ky nang, ly nang, v nang
va nam » van nam, ha nam, va nay
thu va » thuc va, tu va, thu ha
vai va » mai va, dai va, hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang cao hoi. hieu va nam ((thu va) OR (thue va)) hanh vai va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang cao hoi. hieu va nam ((thu va) OR (thue va)) hanh vai va triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoi. hieu va nam ((thu va) OR (thue va)) hanh vai va triet*.