Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
dinh cu » dinh cuu, dinh chuc, dinh chau
va hanh » van hanh, va thanh, va danh
cac lop » cac hop, cac loai
thu sac » thu sach, thu san, thu dac
nang co » nang cao, nang doc, nang noi
thu xac » thau xay
co loi » co hoi
lop va » lap va, hop va, nop va
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sac) OR (thu xac)) ky nang co loi. hieu vien cac lop va hanh ((vi cuu) or (dinh cu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sac) OR (thu xac)) ky nang co loi. hieu vien cac lop va hanh ((vi cuu) OR (dinh cu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sac) OR (thu xac)) ky nang co loi. hieu vien cac lop va hanh ((vi cuu) or (dinh cu)) tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sac) OR (thu xac)) ky nang co loi. hieu vien cac lop va hanh ((vi cuu) or (dinh cu)) tre*.