Perhaps you should try some spelling variations:
trinh dai » trinh tai, trinh di, trinh da
va trinh » van trinh, va tinh, lap trinh
cap nuoc » dat nuoc
cau nuoc » cac nuoc, dau nuoc, chua nuoc
tu sach » thu sach, te sach, tu cach
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
ang xa » lang xa, mang xa, dang xay
ty ang » ty xang, ty hang, ty anh
cua tu » cua tuc, cua su, cua cu

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) or (su sach)) ty ang xa hoi. hieu va ((cau nuoc) OR (cap nuoc)) va trinh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty ang xa hoi. hieu va ((cau nuoc) OR (cap nuoc)) va trinh dai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ty ang xa hoi. hieu va ((cau nuoc) OR (cap nuoc)) va trinh dai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ty ang xa hoi. hieu va ((cau nuoc) OR (cap nuoc)) va trinh dai cua tu*.