Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ky danh » ky anh, ky dang
thuc va » thuc vat, thuc dan, thuc day
tuc va » truc va, tuc xa, duc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky danh) or (ky nang)) xa hoi. hieu van nam ((tuc va) OR (thuc va)) hanh trinh cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky danh) OR (ky nang)) xa hoi. hieu van nam ((tuc va) OR (thuc va)) hanh trinh cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky danh) or (ky nang)) xa hoi. hieu van nam ((tuc va) OR (thuc va)) hanh trinh cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky danh) or (ky nang)) xa hoi. hieu van nam ((tuc va) OR (thuc va)) hanh trinh cua te*.