Perhaps you should try some spelling variations:
lang than » lang thang, lang thanh, sang than
cac nuoc » hoc nuoc, dat nuoc, cua nuoc
than cua » nhan cua, thai cua, ban cua
cap nuoc » dat nuoc
hieu van » hieu va, thien van, lieu va
va lang » va nang, hoa lang
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
sai ky » sac ky
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: thuat ((sach ty) or (sai ky)) nang xa hoi. hieu van ((cac nuoc) or (cap nuoc)) va lang than cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ty) OR (sai ky)) nang xa hoi. hieu van ((cac nuoc) OR (cap nuoc)) va lang than cua te.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ty) or (sai ky)) nang xa hoi. hieu van ((cac nuoc) or (cap nuoc)) va lang than cua te*.