Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cau treo » cau theo, cau tren, cau trieu
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
ba truc » cau truc, ba trung, dai truc
nang xa » nang x, lang xa, nang ma
dan vi » doan vi, don vi, dan va
van ba » van ban, van bao, van bac
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. hieu van ba truc va dan vi ((dua tren) or (((cau treo) OR (cau triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu van ba truc va dan vi ((dua tren) OR (((cau treo) OR (cau triet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu van ba truc va dan vi ((dua tren) or (((cau treo) OR (cau triet))))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van ba truc va dan vi ((dua tren) or (((cau treo) OR (cau triet))))*.