Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
chat truc » cau truc, chat xuc
thu sach » tu sach, thuoc sach, thu hoach
danh dau » lanh dao, hang dau, danh tu
van chat » cao chat
hieu van » hieu va, thien van, lieu va
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
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa

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 sach)) y ((nang xa) OR (nang ma)) hoi. hieu 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 sach)) y ((nang xa) OR (nang ma)) hoi. hieu 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 sach)) y ((nang xa) OR (nang ma)) hoi. hieu van chat truc va danh dau cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) y ((nang xa) OR (nang ma)) hoi. hieu van chat truc va danh dau cua tre*.