Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hang thai » hoang thai, hang tai, hang hai
cham tuc » nham thuc, pham thuc, cham soc
thai cua » than cua, tai cuc, tri cua
toc sach » hoc sach, doc sach, thuoc sach
va hang » van hang, va nang, va lang
tu sach » thu sach, su sach, te sach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
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) or (toc sach)) ky dang xa hoi. lieu va ((cham tuc) OR (tham thuc)) va hang thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky dang xa hoi. lieu va ((cham tuc) OR (tham thuc)) va hang thai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky dang xa hoi. lieu va ((cham tuc) OR (tham thuc)) va hang thai cua tre*".