Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
nang xa » lang xa, nang ma, mang xa
di cua » dai cua, doi cua, de cua

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