Perhaps you should try some spelling variations:
trinh dai » trinh tai, trinh da, trinh dan
tinh dai » tinh da, tinh hai, tinh doi
trinh di » trinh do, trinh dien, trinh dinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va

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 ky nang xa hoi. hieu ve cam xuc va ((((tinh dai) OR (trinh dai))) or (trinh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ve cam xuc va ((((tinh dai) OR (trinh dai))) OR (trinh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ve cam xuc va ((((tinh dai) OR (trinh dai))) or (trinh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ve cam xuc va ((((tinh dai) OR (trinh dai))) or (trinh di)) cua tre*.