Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
cau treo » cau theo, cau triet, cau trieu
thanh va » thanh van, hanh va, thanh ha
tu sach » thu sach, su sach, te sach
cac duc » cao duc, cac dac, cac nuoc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma

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 ve ((cac duc) OR (cac du)) gia thanh va ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi nang xa hoi. hieu ve ((cac duc) OR (cac du)) gia thanh va ((cau treo) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi nang xa hoi. hieu ve ((cac duc) OR (cac du)) gia thanh va ((cau treo) or (cau tren))*".