Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu hoa » tieu hoa, dieu hoa, hiep hoa
thuc dan » thuc hanh, hoc dan, thuc vat
thuc ban » thuoc ban, thu ban, thuc van
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hoa nam » hoai nam, hoat nam, hoa am
vi va » vi van, vai va, vu va

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 (nang ma)) hoi. hieu hoa nam ((thuc ban) OR (thuc dan)) hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang ma)) hoi. hieu hoa nam ((thuc ban) OR (thuc dan)) hanh vi va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (nang ma)) hoi. hieu hoa nam ((thuc ban) OR (thuc dan)) hanh vi va triet*".