Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
thai cua » than cua, tai cuc, tri cua
su sach » vu sach
duc gia » quoc gia
hoc duc » hoc duoc, hoc nuoc, hoc thuc
hieu va » hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
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: ((su sach) OR (so sach)) ky lang xa hoi. ((hieu va) or (lieu va)) hoc duc gia thanh thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky lang xa hoi. ((hieu va) OR (lieu va)) hoc duc gia thanh thai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky lang xa hoi. ((hieu va) or (lieu va)) hoc duc gia thanh thai cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky lang xa hoi. ((hieu va) or (lieu va)) hoc duc gia thanh thai cua te*.