Perhaps you should try some spelling variations:
lang hoa » hang hoa, lang ha, nang hoa
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
va trien » va truyen, va thiet, va tuyen
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
hanh ve » hanh vi, hanh va, hanh kem
le nam » he nam, le na, te nam
ve va » ve van, te va, ke va

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 ky lang hoa hoc. hieu ((le nam) or (ly nam)) thuc van hanh ve va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang hoa hoc. hieu ((le nam) OR (ly nam)) thuc van hanh ve va trien.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang hoa hoc. hieu ((le nam) or (ly nam)) thuc van hanh ve va trien*.