Perhaps you should try some spelling variations:
tinh than » tinh thanh, tinh toan, tinh thai
hieu van » hieu va, thien van, hieu ve
than cua » nhan cua, thai cua, ban cua
va tinh » may tinh
bac luc » bao luc
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
su sac » su sach, su cac, su xac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang xa) OR (nang ma)) hoi. ((hieu van) or (lieu va)) bac luc va tinh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (nang ma)) hoi. ((hieu van) OR (lieu va)) bac luc va tinh than cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang xa) OR (nang ma)) hoi. ((hieu van) or (lieu va)) bac luc va tinh than cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) OR (nang ma)) hoi. ((hieu van) or (lieu va)) bac luc va tinh than cua tre*.