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

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 vi cua 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 vi cua tren.
• Adding a wildcard symbol may retrieve word variants: thu sac ky sang mai hoi. hieu ((ve cam) or (ve cac)) luc va hanh vi cua tren*.