Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
van luan » van quan, van tuan, von luan
cua tre » cua te, cua triet, dua tren
luan va » luan van, luat va
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
ky lang » ky dang, ky tang, tay lang
cuu tre » cau tren, cau treo
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach ((ky lang) or (ky nang)) xa hoi. hieu va cam duc van luan va ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ((ky lang) OR (ky nang)) xa hoi. hieu va cam duc van luan va ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: nuoc sach ((ky lang) or (ky nang)) xa hoi. hieu va cam duc van luan va ((cua tre) or (cuu tre))*.