Perhaps you should try some spelling variations:
lang hoa » hang hoa, lang ha, nang hoa
thuc dan » thuc hanh, hoc dan, thuc vat
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc day
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
vai va » mai va, hai va, lai va
dai va » mai va
ve am » va am

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 hoi. hieu ve am ((thuc va) OR (thuc dan)) hanh ((vai va) or (dai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang hoa hoi. hieu ve am ((thuc va) OR (thuc dan)) hanh ((vai va) OR (dai va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang hoa hoi. hieu ve am ((thuc va) OR (thuc dan)) hanh ((vai va) or (dai va)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang hoa hoi. hieu ve am ((thuc va) OR (thuc dan)) hanh ((vai va) or (dai va)) triet*.