Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » va thanh, va danh, ban hanh
luu tre » luu tru, cuu tre, luy tre
ve cac » va cac, vien cac
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) nang cau hoi. hieu ve cac xuc ((va hanh) OR (van hanh)) vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang cau hoi. hieu ve cac xuc ((va hanh) OR (van hanh)) vi luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang cau hoi. hieu ve cac xuc ((va hanh) OR (van hanh)) vi luu tre*".