Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
tham thuc » nham thuc, pham thuc, tam thuc
va triet » va thiet, va trien, ve triet
thi hang » thi hanh, thi hong, thi thanh
va thanh » gia thanh, ban thanh, va tinh
thi nang » thi cong, ki nang, thi hanh
thuc va » thuc vat, thuc dan, thuc day
va tham » van tham, va cham, va thuat
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
ca hoi » cau hoi, cua hoi, co hoi
hai va » hai van, thai va, hoi va

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 ((thi hang) OR (thi nang)) ((ca hoi) or (xa hoi)). hieu va tham thuc va thanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thi hang) OR (thi nang)) ((ca hoi) OR (xa hoi)). hieu va tham thuc va thanh hai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thi hang) OR (thi nang)) ((ca hoi) or (xa hoi)). hieu va tham thuc va thanh hai va triet*".