Perhaps you should try some spelling variations:
nhanh thi » nhanh thai, nhanh thuc, nhan tai
khanh thi » khanh thu, nhanh thai, phan thi
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
cuc tre » duc tre, cua tre, cuu tre
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
ve cac » va cac, vien cac
o hai » co hai, so hai, o lai

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 ((co hoi) or (o hai)). hieu ve cac xuc van ((khanh thi) OR (nhanh thi)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((co hoi) OR (o hai)). hieu ve cac xuc van ((khanh thi) OR (nhanh thi)) cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((co hoi) or (o hai)). hieu ve cac xuc van ((khanh thi) OR (nhanh thi)) cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((co hoi) or (o hai)). hieu ve cac xuc van ((khanh thi) OR (nhanh thi)) cuc tre*.