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
hieu van » hieu va, thien van, lieu va
tuc thai » thuc thai, toc thai, duc thai
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
tan cua » than cua, tang cua, toan cua
sach ky » sac ky, sach y, sach ty
tuc hai » cuc hai
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 hoi. hieu van nam ((((tuc thai) OR (tuc hai))) 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 hoi. hieu van nam ((((tuc thai) OR (tuc hai))) 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 hoi. hieu van nam ((((tuc thai) OR (tuc hai))) or (thuc tai)) thanh tan cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu van nam ((((tuc thai) OR (tuc hai))) or (thuc tai)) thanh tan cua te*.