Perhaps you should try some spelling variations:
khien muong » chieng muong, khien dong, hien luong
muong viet » luong viet, tuong viet, thuong viet
hoach phap » hoc phap, hoach ha, hanh phap
sach phat » sach nha, sach tham, cach pha
goc khien » ngoc chien, hoc hien, goc nhin
phat ngu » nhat ngu, pham ngu, thuat ngu
phap ngu » nhat ngu, han ngu, phap tu
khien so » khien mo, khien hoc, khien cho
tu sach » thu sach, su sach, te sach
so viet » hoc viet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach phat ngu - goc khien muong viet ) OR ( thu hoach phap ngu - goc khien so viet ))~.
• Adding a wildcard symbol may retrieve word variants: (( tu sach phat ngu - goc khien muong viet ) or ( thu hoach phap ngu - goc khien so viet ))*.