Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cao hoi » co hoi, cao hoc, tao hoi
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
ve cau » ke cau, va cau, le cau
ve cac » va cac, vien cac
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((cao hoi) OR (cau hoi)). hieu ((ve cau) or (ve cac)) truc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((cao hoi) OR (cau hoi)). hieu ((ve cau) OR (ve cac)) truc va hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((cao hoi) OR (cau hoi)). hieu ((ve cau) or (ve cac)) truc va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((cao hoi) OR (cau hoi)). hieu ((ve cau) or (ve cac)) truc va hanh vi luu tre*.