Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh tai » hang tai, han tai, hinh tai
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
tuc va » truc va, tuc xa, duc va
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 dang xa hoi. hieu van nam ((tuc va) OR (thuc va)) ((hanh tai) or (thanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. hieu van nam ((tuc va) OR (thuc va)) ((hanh tai) OR (thanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xa hoi. hieu van nam ((tuc va) OR (thuc va)) ((hanh tai) or (thanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xa hoi. hieu van nam ((tuc va) OR (thuc va)) ((hanh tai) or (thanh tai)) cua te*.