Perhaps you should try some spelling variations:
van cham » van chat, van tham, va cham
lanh hai » manh hai, thanh hai, lang chai
hieu van » hieu va, thien van, lieu va
danh vi » hanh vi, dinh vi, danh di
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
sach ky » sac ky, sach y, sach ty
tuc va » truc va, tuc xa, duc va
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky tang ((lanh hai) or (lap tai)). hieu van cham ((tuc va) OR (thuc va)) danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ((lanh hai) OR (lap tai)). hieu van cham ((tuc va) OR (thuc va)) danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang ((lanh hai) or (lap tai)). hieu van cham ((tuc va) OR (thuc va)) danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang ((lanh hai) or (lap tai)). hieu van cham ((tuc va) OR (thuc va)) danh vi cua te*.