Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
hanh vai » hanh vi, hanh va, hanh tai
thu sac » thu sach, thu san, thu xac
ca tren » cau tren, cu tren, co tren
va hanh » van hanh, va thanh, va danh
la tren » loai tren, dua tren, dat tren
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ve cam » ve cham, va cam, ve cai
luc va » duc va, tuc va, loc va
ve cac » va cac, vien cac

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 ky sang mai hoi. hieu ((ve cam) or (ve cac)) luc va hanh vai ((ca tren) OR (la tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky sang mai hoi. hieu ((ve cam) OR (ve cac)) luc va hanh vai ((ca tren) OR (la tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky sang mai hoi. hieu ((ve cam) or (ve cac)) luc va hanh vai ((ca tren) OR (la tren))".
• Adding a wildcard symbol may retrieve word variants: thu sac ky sang mai hoi. hieu ((ve cam) or (ve cac)) luc va hanh vai ((ca tren) OR (la tren))*.