Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh sua » hinh su, hanh va, hanh tu
may nang » may nong, ky nang, cam nang
va nang » van nang, da nang, cam nang
hieu ve » hieu va, hieu van
duc van » duc tan, duc manh, duc phan
su sach » so sach, vu sach
ve cam » ve cham, ve cac, va cam
sua va » suat va, vua va, xua va
o hoi » co hoi, o hoc, o hai

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 ((may nang) or (va nang)) o hoi. hieu ve cam ((duc van) OR (duc va)) hanh sua va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((may nang) OR (va nang)) o hoi. hieu ve cam ((duc van) OR (duc va)) hanh sua va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((may nang) or (va nang)) o hoi. hieu ve cam ((duc van) OR (duc va)) hanh sua va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((may nang) or (va nang)) o hoi. hieu ve cam ((duc van) OR (duc va)) hanh sua va triet*.