Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
toc sach » hoc sach, doc sach, thuoc sach
xang xa » lang xa, mang xa, ang xa
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
lap cua » lai cua, tap cua, lam cua
y xang » ty xang
do van » dao van, vo van, so van
cua cu » cua chu, cua cau, cua su
do va » so va
o va » so va, co va, bo va

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 y xang xa hoi. hieu vu kham ((o va) or (((do va) OR (do van)))) thanh lap cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y xang xa hoi. hieu vu kham ((o va) OR (((do va) OR (do van)))) thanh lap cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y xang xa hoi. hieu vu kham ((o va) or (((do va) OR (do van)))) thanh lap cua cu".
• Adding a wildcard symbol may retrieve word variants: toc sach y xang xa hoi. hieu vu kham ((o va) or (((do va) OR (do van)))) thanh lap cua cu*.