Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
thanh ha » thanh hoa, thanh hai, nhanh ha
su sach » so sach, vu sach
van cau » van dau, van hau, van chat
cau luc » cau truc, cau phuc
luc gia » luoc gia, duc gia, quoc gia
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y nang) or (v nang)) xa hoi. thien van cau luc gia thanh ha ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) xa hoi. thien van cau luc gia thanh ha ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (v nang)) xa hoi. thien van cau luc gia thanh ha ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) xa hoi. thien van cau luc gia thanh ha ((cua tre) OR (cua triet))*.