Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau phuc » cau truc, chau phu, huu phuc
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cau luc » cau truc
sach ky » sac ky, sach y, sach kem
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
ca tren » cau tren, cu tren, la tren
ma hoi » mai hoi, xa hoi, ma hoa
vi ca » vit ca, li ca, va ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((sach ky) OR (sach ty)) nang ma hoi. hieu van ((cau luc) or (cau phuc)) va danh vi ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sach ty)) nang ma hoi. hieu van ((cau luc) OR (cau phuc)) va danh vi ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach ky) OR (sach ty)) nang ma hoi. hieu van ((cau luc) or (cau phuc)) va danh vi ca tren".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) OR (sach ty)) nang ma hoi. hieu van ((cau luc) or (cau phuc)) va danh vi ca tren*.