Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan
sach ky » sac ky, sach y, sach ty
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
su sach » so sach, vu sach
ha hoi » hoa hoi, ha noi, xa hoi
van am » van nam, van lam, van dam

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 lang ha hoi. hieu van am ((thuc dan) or (thuc vat)) hanh ((vai cua) OR (hai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang ha hoi. hieu van am ((thuc dan) OR (thuc vat)) hanh ((vai cua) OR (hai cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang ha hoi. hieu van am ((thuc dan) or (thuc vat)) hanh ((vai cua) OR (hai cua)) triet*".