Perhaps you should try some spelling variations:
va trien » va truyen, va tuyen, va tieng
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
sach ly » sach y, sach lo, sach ty
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
ve nam » he nam, va nam, le nam
thiet » thieu

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 ly ((nang ma) or (sang ma)) hoi. hieu ve nam thuc va hanh va ((va trien) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((nang ma) OR (sang ma)) hoi. hieu ve nam thuc va hanh va ((va trien) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach ly ((nang ma) or (sang ma)) hoi. hieu ve nam thuc va hanh va ((va trien) or (va thiet))*.