Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
toc sach » hoc sach, doc sach, thuoc sach
phan cua » nhan cua, than cua, phat cua
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
va nam » van nam, ha nam, va nay
tuc va » thuc va, tuc xa, duc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky lang) or (ky tang)) xa hoi. hieu va nam ((tuc va) OR (truc va)) thanh phan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky tang)) xa hoi. hieu va nam ((tuc va) OR (truc va)) thanh phan cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) or (ky tang)) xa hoi. hieu va nam ((tuc va) OR (truc va)) thanh phan cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) or (ky tang)) xa hoi. hieu va nam ((tuc va) OR (truc va)) thanh phan cua te*.