Perhaps you should try some spelling variations:
hieu cac » hieu luc, hieu va, hieu van
van hanh » van thanh, ban hanh, van anh
chat huu » pham huu
tong cho » trong cho, dong cho, rong cho
cac chat » cao chat, cac thuat, cac nha
cua cau » cua cac, cua chu, cua can
huu van » cuu van, huu han, luu van
te cach » te sach, tu cach, te cac
cho hoc » co hoc, khoa hoc
tu tong » tu tuong, tu trong, tu dong
ve cach » va cach, ve cac, ve canh
cua cay » cua cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cach) OR (ve cach)) tu tong cho hoc. hieu cac chat huu van hanh vi ((cua cau) OR (cua cay))~.
• Adding a wildcard symbol may retrieve word variants: ((te cach) or (ve cach)) tu tong cho hoc. hieu cac chat huu van hanh vi ((cua cau) or (cua cay))*.