Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau treo » cau theo, cau triet, cau trieu
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
ty hang » ly hang, ty xang, thi hang
va kinh » va tinh, qua kinh
kinh va » kinh van, tinh va, sinh va
ty nang » ky nang, ty xang, ly nang
van cam » van nam, van lam, van cau
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty nang) or (ty hang)) xa hoi. hieu van cam xuc va kinh va ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ty hang)) xa hoi. hieu van cam xuc va kinh va ((cau treo) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) or (ty hang)) xa hoi. hieu van cam xuc va kinh va ((cau treo) or (cau tren))*.