Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
thu sach » tu sach, thuat sach, thuoc sach
van chat » cao chat
danh dau » lanh dao, hang dau, danh tu
dau cua » dai cua, day cua, cau cua
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
va chat » va phat, cao chat, hoa chat
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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) or (thuat lanh)) y nang x hoi. lieu ((va chat) OR (van chat)) truc va danh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat lanh)) y nang x hoi. lieu ((va chat) OR (van chat)) truc va danh dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat lanh)) y nang x hoi. lieu ((va chat) OR (van chat)) truc va danh dau cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat lanh)) y nang x hoi. lieu ((va chat) OR (van chat)) truc va danh dau cua tre*.