Perhaps you should try some spelling variations:
thuc dang » thuoc dang, thuc dung, thu dang
thuc dan » thuc hanh, hoc dan, thuc vat
thanh va » thanh van, hanh va, thanh ha
ve triet » va trien, su triet
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
bo sac » bo sach
va ve » va de, va le, va vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sac ((ky lang) or (ky tang)) xa hoi. lieu va cac ((thuc dang) OR (thuc dan)) thanh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sac ((ky lang) OR (ky tang)) xa hoi. lieu va cac ((thuc dang) OR (thuc dan)) thanh va ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sac ((ky lang) or (ky tang)) xa hoi. lieu va cac ((thuc dang) OR (thuc dan)) thanh va ve triet".
• Adding a wildcard symbol may retrieve word variants: bo sac ((ky lang) or (ky tang)) xa hoi. lieu va cac ((thuc dang) OR (thuc dan)) thanh va ve triet*.