Perhaps you should try some spelling variations:
chat truc » cau truc
toc sach » hoc sach, doc sach, thuoc sach
chat xuc » chat huu, cam xuc, chao xu
hieu van » hieu va, thien van, lieu va
xanh di » vanh dai, xanh tai
danh di » danh du, danh dien, danh gia
cua tre » cua te, cuu tre, cua triet
cao hoi » cau hoi, co hoi, cao hoc
sach v » sach va, sach y, sach 2
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: toc sach v nang cao hoi. hieu van ((chat truc) or (chat xuc)) va ((danh di) OR (xanh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang cao hoi. hieu van ((chat truc) OR (chat xuc)) va ((danh di) OR (xanh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang cao hoi. hieu van ((chat truc) or (chat xuc)) va ((danh di) OR (xanh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang cao hoi. hieu van ((chat truc) or (chat xuc)) va ((danh di) OR (xanh di)) cua tre*.