Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
nam thuc » nam thuoc, am thuc, nam thu
nam duc » nam duoc, pham duc, nam buoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
cau hoa » cau hoi
cam hoa » chat hoa, pham hoa, tham hoa
ky danh » ky anh, ky dang
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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 danh ((cau hoa) or (cam hoa)). hieu van ((nam duc) or (nam thuc)) va hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky danh ((cau hoa) OR (cam hoa)). hieu van ((nam duc) OR (nam thuc)) va hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky danh ((cau hoa) or (cam hoa)). hieu van ((nam duc) or (nam thuc)) va hanh thai cua tre*.