Perhaps you should try some spelling variations:
hang truc » khung truc
thien van » thi van
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
hanh va » hang va, hanh vi
tang ma » mang may, tang van
va hanh » van hanh, va thanh, va danh
ha truc » ba truc, ha thuc, cau truc
va cua » va chua, via cua, ca cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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 (tang ma)) hoi. thien van ((ha truc) OR (hang truc)) va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (tang ma)) hoi. thien van ((ha truc) OR (hang truc)) va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang xa) or (tang ma)) hoi. thien van ((ha truc) OR (hang truc)) va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) or (tang ma)) hoi. thien van ((ha truc) OR (hang truc)) va hanh va cua tre*.