Perhaps you should try some spelling variations:
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
va ve » va de, va le, va vi

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 y ((mang may) or (nang x)) hoi. ((hieu ve) or (hieu va)) cam duc va danh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((mang may) OR (nang x)) hoi. ((hieu ve) OR (hieu va)) cam duc va danh va ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((mang may) or (nang x)) hoi. ((hieu ve) or (hieu va)) cam duc va danh va ve triet*.