Perhaps you should try some spelling variations:
thien van » thi van
dang thai » dang thi, dang hai, dang khai
cac nuoc » cap nuoc, hoc nuoc, cua nuoc
thai cua » than cua, tai cuc, tri cua
sach thu » sach thue, sach thieu, sach tham
va dang » van dang, va nang, va lang
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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) OR (sach thu)) nang xa hoi. thien van ((cac nuoc) or (dat nuoc)) va dang thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang xa hoi. thien van ((cac nuoc) OR (dat nuoc)) va dang thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach thu)) nang xa hoi. thien van ((cac nuoc) or (dat nuoc)) va dang thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach thu)) nang xa hoi. thien van ((cac nuoc) or (dat nuoc)) va dang thai cua tre*.