Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh va » hang va
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
sai ky » sac ky
soc va » hoc va, loc va, doc va
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((sang ma) or (nang x)) hoi. hieu ve cham soc va ((hanh va) or (hanh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((sang ma) OR (nang x)) hoi. hieu ve cham soc va ((hanh va) OR (hanh vi)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((sang ma) or (nang x)) hoi. hieu ve cham soc va ((hanh va) or (hanh vi)) cau tren*.