Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
dieu thien » dieu khien, dieu hien, dieu kien
vuc van » duc van, luc van, thuc van
xuc van » duc van, luc van, xuc ban
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
huu tre » huu tri, cuu tre, huu them
va huu » vu huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang ma) or (nang x)) hoi. dieu thien hach ((xuc van) or (vuc van)) hang va huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang ma) OR (nang x)) hoi. dieu thien hach ((xuc van) OR (vuc van)) hang va huu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang ma) or (nang x)) hoi. dieu thien hach ((xuc van) or (vuc van)) hang va huu tre*.