Perhaps you should try some spelling variations:
chat truc » cau truc, chat xuc
danh dau » lanh dao, hang dau, danh tu
hieu cao » chieu cao, hieu ca, kieu cao
hieu cac » hieu luc, hieu va, hieu van
tu sach » thu sach, su sach, te sach
dau cua » dai cua, day cua, cau cua
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
ky lang » ky dang, ky tang, tay lang

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 lang) OR (ky nang)) xa hoi. ((hieu cao) or (hieu cac)) chat truc va danh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. ((hieu cao) OR (hieu cac)) chat truc va danh dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky nang)) xa hoi. ((hieu cao) or (hieu cac)) chat truc va danh dau cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky nang)) xa hoi. ((hieu cao) or (hieu cac)) chat truc va danh dau cua tre*.