Perhaps you should try some spelling variations:
vien dai » hien dai
tu sach » thu sach, su sach, te sach
cao hoa » cao hoat, cao khoa, cau hoa
viec va » vien va, viec cua, viec lam
va hang » van hang, va nang, va lang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua

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 y nang cao hoa. hieu ((viec va) or (vien dai)) tu va hang va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang cao hoa. hieu ((viec va) OR (vien dai)) tu va hang va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang cao hoa. hieu ((viec va) or (vien dai)) tu va hang va cua tre*.