Perhaps you should try some spelling variations:
dat tren » dat trong, dua tren
cau tren » cu tren, dau tren, ca tren
hanh vai » hanh vi, hanh va, hanh tai
tai khoa » da khoa, noi khoa
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ky sang) or (ky tang)) tai khoa. hieu ve cam xuc va hanh vai ((cau tren) or (dat tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky sang) OR (ky tang)) tai khoa. hieu ve cam xuc va hanh vai ((cau tren) OR (dat tren)).
• Adding a wildcard symbol may retrieve word variants: so sach ((ky sang) or (ky tang)) tai khoa. hieu ve cam xuc va hanh vai ((cau tren) or (dat tren))*.