Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
tinh bai » tinh bac, tinh hai, hinh bai
dan tinh » doan tinh, dang tinh, dan trinh
hieu van » hieu va, thien van, lieu va
sach thu » sach thieu, sach tham, cach thuc
cac nuoc » cap nuoc, hoc nuoc, cua nuoc
bai cua » ban cua, dai cua, bai ca
nang xa » nang x, lang xa, nang ma
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: vu ((sach thu) OR (sach thue)) nang xa hoi. hieu van ((cac nuoc) or (dat nuoc)) dan tinh bai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach thu) OR (sach thue)) nang xa hoi. hieu van ((cac nuoc) OR (dat nuoc)) dan tinh bai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach thu) OR (sach thue)) nang xa hoi. hieu van ((cac nuoc) or (dat nuoc)) dan tinh bai cua te".
• Adding a wildcard symbol may retrieve word variants: vu ((sach thu) OR (sach thue)) nang xa hoi. hieu van ((cac nuoc) or (dat nuoc)) dan tinh bai cua te*.