Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
cuu tre » cua tre, cau tren, cau treo
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao
vi cuu » vi luu, vinh cuu
loc va » hoc va, luc va
sac ky » cac ky
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac

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

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