Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
kinh day » kinh dao, kinh tay, kinh danh
hieu van » hieu va, thien van, lieu va
tu sach » su sach, tu cach, vu sach
day cua » dai cua
va kinh » va tinh, qua kinh
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet

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) or (thu sach))) or (te sach)) ky tang xa hoi. hieu van cau truc va kinh day cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu sach))) OR (te sach)) ky tang xa hoi. hieu van cau truc va kinh day cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (thu sach))) or (te sach)) ky tang xa hoi. hieu van cau truc va kinh day cua tre*.