Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, te sach, tu cach
cam tuc » cam xuc, cam tu, dam thuc
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach

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)) ty nang xa hoi. hieu ve ((cam tuc) OR (nam thuc)) va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang xa hoi. hieu ve ((cam tuc) OR (nam thuc)) va hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ty nang xa hoi. hieu ve ((cam tuc) OR (nam thuc)) va hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ty nang xa hoi. hieu ve ((cam tuc) OR (nam thuc)) va hanh vai cuu tre*.