Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, cau treo
ca tren » cu tren, la tren, co tren
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
xuc va » duc va, tuc va, luc va
ve cac » va cac, vien cac

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 ky ((sang ma) or (nang x)) hoi. hieu ve cac xuc va hanh vi ((ca tren) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang ma) OR (nang x)) hoi. hieu ve cac xuc va hanh vi ((ca tren) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang ma) or (nang x)) hoi. hieu ve cac xuc va hanh vi ((ca tren) or (cau tren))*.