Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam truc » cau truc, nam truc, lam truoc
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (cac ky)) nang cao hoi. hieu van cam truc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (cac ky)) nang cao hoi. hieu van cam truc va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (cac ky)) nang cao hoi. hieu van cam truc va hanh vi cua vat*.