Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hang doi » hang loi, huong doi, hang tai
sach ky » sac ky, sach y, sach ty
hang di » hang vi, hang dien, hang dich
tu sach » thu sach, su sach, te sach
nam luc » nang luc, nhan luc, nam duoc
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cu tren » tu tren, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky tang xa hoi. lieu va ((nam luc) or (nam thuc)) va ((hang di) OR (hang doi)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang xa hoi. lieu va ((nam luc) OR (nam thuc)) va ((hang di) OR (hang doi)) cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky tang xa hoi. lieu va ((nam luc) or (nam thuc)) va ((hang di) OR (hang doi)) cu tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang xa hoi. lieu va ((nam luc) or (nam thuc)) va ((hang di) OR (hang doi)) cu tren*.