Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
nam thuc » nam thuoc, am thuc, nam thu
van tai » von tai, van tuan
dan tai » dan thi, han tai, ban tai
dan vai » dan va, dan vat, den vai
hoc sac » hoc sach, hoc cac, hoc mac
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam

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 ve nam thuc va ((dan vai) or (((dan tai) or (van tai)))) va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang xa hoi. hieu ve nam thuc va ((dan vai) OR (((dan tai) OR (van tai)))) va trien.
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang xa hoi. hieu ve nam thuc va ((dan vai) or (((dan tai) or (van tai)))) va trien*.