Perhaps you should try some spelling variations:
thanh tan » thanh toan, thanh tuan, thanh san
toc sach » hoc sach, doc sach, thuoc sach
thuc tai » thuc thai, thuoc tai, thuc tap
tuc thai » thuc thai, toc thai, tuc hai
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
tan cua » than cua, tang cua, toan cua
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: toc sach ky ((lang xa) OR (lang van)) hoi. hieu van nam ((tuc thai) or (thuc tai)) thanh tan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang xa) OR (lang van)) hoi. hieu van nam ((tuc thai) OR (thuc tai)) thanh tan cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((lang xa) OR (lang van)) hoi. hieu van nam ((tuc thai) or (thuc tai)) thanh tan cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) OR (lang van)) hoi. hieu van nam ((tuc thai) or (thuc tai)) thanh tan cua te*.