Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
thang doi » thang loi, hang doi, thay doi
va triet » va thiet, va trien, ve triet
thuc van » thuc vat, thuc dan, thuc va
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va lam » van lam, va lap
va am » va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ma hoi. hieu ((va am) or (va lam)) thuc van ((thang doi) OR (thanh doi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. hieu ((va am) OR (va lam)) thuc van ((thang doi) OR (thanh doi)) va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ma hoi. hieu ((va am) or (va lam)) thuc van ((thang doi) OR (thanh doi)) va triet*".