Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hoang » van hoan, quan hoang, tran hoang
sach thu » sach thue, sach thieu, sach tham
hoang di » hoang dai, hoang de, hang di
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
nang xa » lang xa, nang ma, mang xa
cam tuc » cam xuc, cam tu, dam thuc
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: so sach thu ((nang xa) or (nang x)) hoi. hieu van ((cam tuc) OR (nam thuc)) van hoang di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu ((nang xa) OR (nang x)) hoi. hieu van ((cam tuc) OR (nam thuc)) van hoang di cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu ((nang xa) or (nang x)) hoi. hieu van ((cam tuc) OR (nam thuc)) van hoang di cua triet*".