Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
tinh via » tinh gia, tinh va, tinh vi
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
sang tao » hang tai
via cua » gia cua, gian cua, giau cua
va tinh » may tinh
cac xuc » cam xuc, chat xuc, cac cuoc
tu sach » thu sach, su sach, tu cach
tao hoi » tao khoi, tao boi, tay hoi
ky sang » ky nang, ky dang, ky tang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet

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) or (te sach)) ky sang tao hoi. hieu viec ((cac xuc) OR (cac nuoc)) va tinh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky sang tao hoi. hieu viec ((cac xuc) OR (cac nuoc)) va tinh via cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky sang tao hoi. hieu viec ((cac xuc) OR (cac nuoc)) va tinh via cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky sang tao hoi. hieu viec ((cac xuc) OR (cac nuoc)) va tinh via cua tre*.