Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
vien cac » vien bach, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cua triet, dua tren
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cao dan » cao dang, cao danh, cac dan
ty nang » ky nang, ty xang, ty hang
cuu tre » cau tren, cau treo
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 sach ty nang cao dan. hieu ((ve cac) or (vien cac)) duc van hanh thai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang cao dan. hieu ((ve cac) OR (vien cac)) duc van hanh thai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang cao dan. hieu ((ve cac) or (vien cac)) duc van hanh thai ((cua tre) or (cuu tre))*.