Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
dinh hai » dinh thai, tinh hai, dinh ha
dau tren » dau tien, dat tren, dau tieng
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
su sach » so sach, vu sach
va dinh » van dinh, va kinh, va tinh
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
van cau » van dau, van hau, van chat
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cu tren » tu tren, dua tren

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 cau thuc va dinh hai ((cau triet) or (((dau tren) or (cu tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu van cau thuc va dinh hai ((cau triet) OR (((dau tren) OR (cu tren)))).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu van cau thuc va dinh hai ((cau triet) or (((dau tren) or (cu tren))))*.