Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
nam vuc » nam vung, nam thuc, nam duoc
vuc van » duc van, luc van, thuc van
ban tai » han tai, ban thi, ban gai
van tai » von tai, van tuan
cuc te » cua te, cuc thue, cuc tieu

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 thi nang xa hoi. hieu van nam vuc van ((ban tai) OR (van tai)) cuc te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi nang xa hoi. hieu van nam vuc van ((ban tai) OR (van tai)) cuc te".
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang xa hoi. hieu van nam vuc van ((ban tai) OR (van tai)) cuc te*.