Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
va lang » va nang, hoa lang
va hang » van hang, va nang, va hanh
tu sach » thu sach, su sach, te sach
tang xa » trang xa, tang ma, lang xa
nam luc » nang luc, nhan luc, nam duoc
ky tang » ky nang, ky dang, kho tang
cu tren » tu tren, dua tren
di cu » di cau, di cua, di du

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) OR (va lang)) di 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) OR (va lang)) di 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) OR (va lang)) di 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) OR (va lang)) di cu tren*.