Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cau treo » cau theo, cau tren, cau trieu
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty lang ((hoa hoi) or (xa hoi)). hieu va cac tu va hanh vi ((cau treo) or (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang ((hoa hoi) OR (xa hoi)). hieu va cac tu va hanh vi ((cau treo) OR (cau triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang ((hoa hoi) or (xa hoi)). hieu va cac tu va hanh vi ((cau treo) or (cau triet))*.