Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
thu hang » thi hang, thuc hanh, thu huong
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
tu hang » tu hanh, tu hung, ty hang
va pham » van pham, va phat, va phap
duc van » duc va, duc manh, duc phan
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 ((tu hang) or (thu hang)) xa hoi. lieu va pham ((duc van) OR (duc tan)) thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu hang) OR (thu hang)) xa hoi. lieu va pham ((duc van) OR (duc tan)) thanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu hang) or (thu hang)) xa hoi. lieu va pham ((duc van) OR (duc tan)) thanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu hang) or (thu hang)) xa hoi. lieu va pham ((duc van) OR (duc tan)) thanh thai cua tre*.