Perhaps you should try some spelling variations:
chat truc » cau truc, chat xuc
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
danh dai » danh dau, danh di, danh sai
thu sach » tu sach, thuat sach, thuoc sach
hieu cac » hieu luc, hieu va, vien cac
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. ((hieu cac) OR (hieu van)) chat truc va danh dai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. ((hieu cac) OR (hieu van)) chat truc va danh dai ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. ((hieu cac) OR (hieu van)) chat truc va danh dai ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu cac) OR (hieu van)) chat truc va danh dai ((dua tren) or (cuu tre))*.