Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
viet cua » viec cua, viet ca, viet qua
nang xa » nang x, lang xa, mang xa
van anh » van thanh, tuan anh, van minh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cac co » cac cong
cac lo » cac lop, cac bo, cac ho
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: thuat sach ky ((nang xa) or (nang ma)) hoi. hieu ve ((cac lo) or (cac co)) van anh viet cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (nang ma)) hoi. hieu ve ((cac lo) OR (cac co)) van anh viet cua te.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (nang ma)) hoi. hieu ve ((cac lo) or (cac co)) van anh viet cua te*.