Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
van thanh » ban thanh, van tuan
tu sach » thu sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
va nam » van nam, ha nam, va nay
vi cu » vi su, vi xu, vi 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) OR (su sach)) ky nang xa hoi. hieu va nam thuoc ((va hanh) or (van thanh)) vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu va nam thuoc ((va hanh) OR (van thanh)) vi cu tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang xa hoi. hieu va nam thuoc ((va hanh) or (van thanh)) vi cu tren*".