Perhaps you should try some spelling variations:
dau trong » dat trong, dao trong, dai trong
sach thu » sach thue, sach thieu, sach tham
dat tren » dat trong, dua tren
toc sach » hoc sach, doc sach, thuoc sach
lang hoa » hang hoa, lang ha, nang hoa
thu lang » thu hang, thu bang, phu lang
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
va cau » van cau, va cac, va dau
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thu lang hoa hoc. hieu va cau ((xuc va) OR (tuc va)) hanh va ((dat tren) or (dau trong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thu lang hoa hoc. hieu va cau ((xuc va) OR (tuc va)) hanh va ((dat tren) OR (dau trong))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thu lang hoa hoc. hieu va cau ((xuc va) OR (tuc va)) hanh va ((dat tren) or (dau trong))*".