Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cau treo » cau theo, cau tren, cau trieu
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
ban truc » ba truc, ban thuoc, xuan truc
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
dan vi » doan vi, don vi, dan va
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 ty nang xa hoi. hieu van ban 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 ty nang xa hoi. hieu van ban truc va dan vi ((dua tren) OR (((cau treo) OR (cau triet)))).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu van ban truc va dan vi ((dua tren) or (((cau treo) or (cau triet))))*.