Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
sach tu » sach thu, cach tu, sach ty
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
nano ma » nang ma, nano va, nano bac
tu nano » truc nano
hac xuc » chat xuc
va hac » van hac, va khac, va cac
ma hoi » mai hoi, xa hoi, ma hoa
lai ve » loai ve, lai va, la ve

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 tu nano ma hoi. hieu va hac xuc ((van hanh) or (va danh)) lai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nano ma hoi. hieu va hac xuc ((van hanh) OR (va danh)) lai ve triet*.