Perhaps you should try some spelling variations:
nam xuat » nam luat, pham xuat, san xuat
hieu van » hieu va, thien van, lieu va
kinh va » kinh van, tinh va, sinh va
va kinh » va tinh, qua kinh
nam xua » nam cua, nam mua, nam qua
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky
va cuu » va cau, va chu, va huu

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) or (sach ty)) lang xa hoi. hieu van ((nam xuat) OR (nam xua)) va kinh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach ty)) lang xa hoi. hieu van ((nam xuat) OR (nam xua)) va kinh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sach ty)) lang xa hoi. hieu van ((nam xuat) OR (nam xua)) va kinh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sach ty)) lang xa hoi. hieu van ((nam xuat) OR (nam xua)) va kinh va cuu tre*.