Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cam lo » nam lo, cam ly, cam o
lo van » le van, vo van, so van
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: tu sach ky dang xa hoi. ((hieu va) OR (hieu qua)) cam lo van ((thanh san) or (hanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. ((hieu va) OR (hieu qua)) cam lo van ((thanh san) OR (hanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. ((hieu va) OR (hieu qua)) cam lo van ((thanh san) or (hanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. ((hieu va) OR (hieu qua)) cam lo van ((thanh san) or (hanh tai)) cua te*.