Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
dua tren » dung tren
vien cac » vien bach, vien dai, vien da
va thanh » gia thanh, ban thanh, va tinh
sang dai » sang tai, lang dai, sang mai
cuu tre » cua tre, cau tren, cau treo
ky sang » ky nang, ky dang, ky tang
dai hoi » dai hoc, dai hai, dai moi
luc va » duc va, tuc va, loc va
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 cac ky sang dai hoi. hieu ((ve cac) OR (vien cac)) luc va thanh vai ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky sang dai hoi. hieu ((ve cac) OR (vien cac)) luc va thanh vai ((cuu tre) OR (dua tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky sang dai hoi. hieu ((ve cac) OR (vien cac)) luc va thanh vai ((cuu tre) or (dua tren))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky sang dai hoi. hieu ((ve cac) OR (vien cac)) luc va thanh vai ((cuu tre) or (dua tren))*.