Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
xach tay » canh tay
nang dau » hang dau, xang dau, nang du
hieu van » hieu va, thien van, lieu va
danh tai » doanh tai, dinh tai, hanh tai
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, dua tren
cam luc » cam xuc, cau luc
dau hoi » cau hoi, dai hoi, dan hoi
van cam » van nam, van lam, van cau
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (xach tay)) nang dau hoi. hieu van cam luc va danh tai ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (xach tay)) nang dau hoi. hieu van cam luc va danh tai ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (xach tay)) nang dau hoi. hieu van cam luc va danh tai ((cua tre) OR (cua triet))*.