Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh do » thanh de, thanh pho, thanh hoa
van cham » van chat, van tham, va cham
su triet » su viet, su tien, ve triet
thu sach » tu sach, thuat sach, thuoc sach
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
tu cach » tu cac
y nang » ky nang, ly nang, v nang
do su » do sut, do tu, co su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) y nang x ho. hieu van cham ((truc va) OR (thuc va)) thanh do su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) y nang x ho. hieu van cham ((truc va) OR (thuc va)) thanh do su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) y nang x ho. hieu van cham ((truc va) OR (thuc va)) thanh do su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) y nang x ho. hieu van cham ((truc va) OR (thuc va)) thanh do su triet*.