Perhaps you should try some spelling variations:
sang tao » hang tai
hanh lai » hanh lam, hanh tai, thanh lap
hieu va » lieu va, hieu qua
cam loc » cam lo
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
loc va » hoc 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: te sac ky ((mang may) or (sang tao)) hoi. hieu va cam loc va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((mang may) OR (sang tao)) hoi. hieu va cam loc va hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((mang may) or (sang tao)) hoi. hieu va cam loc va hanh lai cua tre*.