Perhaps you should try some spelling variations:
sach phap » sach phat, sach nha, sach tham
phap ngoc » pham ngoc, phap nuoc, phan ngoc
ngoc viet » hoc viet
goc khien » ngoc chien, hoc hien, goc nhin
khien moi » khien mo, thien moi, khien hoi
viet che » viet cho, viet chu, viet theo
che viet » chu viet, nghe viet, thue viet
phap ngu » nhat ngu, han ngu, phap tu
moi viec » mai viet, moi ve
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach phap ngoc - ngoc viet che viet ) or ( su sach phap ngu - goc khien moi viec ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach phap ngoc - ngoc viet che viet ) OR ( su sach phap ngu - goc khien moi viec )).
• Adding a wildcard symbol may retrieve word variants: (( su sach phap ngoc - ngoc viet che viet ) or ( su sach phap ngu - goc khien moi viec ))*.