Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
vat thanh » dat thanh, gat thanh, tat thanh
nam thuc » am thuc, nam thu, nam tu
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ha » hieu hoa, hieu va, hieu ca
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu ha ((nam thuc) OR (nam thuoc)) vat thanh ((vai cua) or (lai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu ha ((nam thuc) OR (nam thuoc)) vat thanh ((vai cua) OR (lai cua)) viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu ha ((nam thuc) OR (nam thuoc)) vat thanh ((vai cua) or (lai cua)) viet*".