Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
lam truoc » lam thuoc, nam truoc, lam truong
cau treo » cau theo, cau tren, cau trieu
doan hai » doanh tai, hoang hai, doan va
truoc va » truc va, thuoc va, truong va
hieu van » hieu va, thien van, lieu va
va doan » va doanh, van doan, va dan
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
van lam » van nam
ma hoi » mai hoi, xa hoi, me hoi

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 ((ma hoi) or (ma hoa)). hieu van lam truoc va doan hai ((cau treo) OR (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((ma hoi) OR (ma hoa)). hieu van lam truoc va doan hai ((cau treo) OR (cau triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang ((ma hoi) or (ma hoa)). hieu van lam truoc va doan hai ((cau treo) OR (cau triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((ma hoi) or (ma hoa)). hieu van lam truoc va doan hai ((cau treo) OR (cau triet))*.