Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
cham duc » pham duc, cham soc, pham duy
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
duc van » duc va, duc tan, duc manh
tu nang » tru nang, tu nong, tu nano
te sach » toc sach

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