Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
kha nang » phap nang, ki nang, thi nang
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
tham luc » than luc, tham nuoc, tham thuc
vu nang » vuc nang, va nang, vu dang
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua
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: hoc sach ((vu nang) or (((kha nang) OR (ky nang)))) xa hoi. hieu van tham luc va hang di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((vu nang) OR (((kha nang) OR (ky nang)))) xa hoi. hieu van tham luc va hang di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((vu nang) or (((kha nang) OR (ky nang)))) xa hoi. hieu van tham luc va hang di cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((vu nang) or (((kha nang) OR (ky nang)))) xa hoi. hieu van tham luc va hang di cua te*.