Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hoc sac » hoc sach, hoc cac, hoc mac
dan vai » dan va, dan vat, den vai
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
han tai » hang tai, nhan tai, van tai
thuc va » thuc vat, thuc dan, thuc day
dan tai » van tai, dan thi, ban tai
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sac ky nang xa hoi. hieu va nam thuc va ((dan vai) or (((dan tai) or (han tai)))) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang xa hoi. hieu va nam thuc va ((dan vai) OR (((dan tai) OR (han tai)))) va thiet.
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang xa hoi. hieu va nam thuc va ((dan vai) or (((dan tai) or (han tai)))) va thiet*.