Perhaps you should try some spelling variations:
danh hai » dang hai, lanh hai, manh hai
cau tren » dau tren, ca tren, cau tieng
cau treo » cau theo, cau triet, cau trieu
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
sach ly » sach y, sach lo, sach ty
su sach » so sach, vu sach
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
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 ly nang xa hoi. hieu van nam thuc va danh hai ((cau treo) or (((cau tren) or (cu tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang xa hoi. hieu van nam thuc va danh hai ((cau treo) OR (((cau tren) OR (cu tren)))).
• Adding a wildcard symbol may retrieve word variants: su sach ly nang xa hoi. hieu van nam thuc va danh hai ((cau treo) or (((cau tren) or (cu tren))))*.