Perhaps you should try some spelling variations:
dua tren » dung tren
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
hieu van » hieu va, thien van, lieu va
cu tren » tu tren
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
nang ho » nang hoc, nang co, tang ho
ho hoi » hoc hoi, hoa hoi, hoi hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky nang ho hoi. hieu van ((cham soc) or (cam xuc)) va thanh va ((cu tren) OR (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky nang ho hoi. hieu van ((cham soc) OR (cam xuc)) va thanh va ((cu tren) OR (dua tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky nang ho hoi. hieu van ((cham soc) or (cam xuc)) va thanh va ((cu tren) OR (dua tren))*".