Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
sach ky » sac ky, sach ty, sach kem
nam sua » nam cua, nam suu, nam mua
va kinh » va tinh, qua kinh
kinh vi » dinh vi, kinh ve, kenh vi
va nam » van nam, ha nam, va nay
sua va » suat va, vua va, xua va
vi dau » vi dai, va dau, bi dau
x hoi » xa hoi, o hoi, 5 hoi

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 ((x hoi) OR (x ho)). lieu va nam sua va kinh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ((x hoi) OR (x ho)). lieu va nam sua va kinh vi dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang ((x hoi) OR (x ho)). lieu va nam sua va kinh vi dau tren".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang ((x hoi) OR (x ho)). lieu va nam sua va kinh vi dau tren*.