Perhaps you should try some spelling variations:
hoc thuc » hoc huu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
hieu te » hieu ve, hien te, hieu he
thuc va » thuc vat, thuc dan, thuc day
va tich » va tinh, va dich
va cua » va chua, via cua, ca cua
cua te » cua tu

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 ky ((nang xa) or (sang ma)) hoi. hieu te hoc thuc va tich va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (sang ma)) hoi. hieu te hoc thuc va tich va cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (sang ma)) hoi. hieu te hoc thuc va tich va cua te*.