Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
thuc van » thuc vat, thuc dan, thuc va
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tuc van » truc van, tuc va, duc van
hanh va » hanh vi
va co » vo co

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 ky nang cau hoi. lieu va co ((tuc van) or (thuc van)) ((hanh va) OR (hang va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cau hoi. lieu va co ((tuc van) OR (thuc van)) ((hanh va) OR (hang va)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cau hoi. lieu va co ((tuc van) or (thuc van)) ((hanh va) OR (hang va)) cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cau hoi. lieu va co ((tuc van) or (thuc van)) ((hanh va) OR (hang va)) cau tren*.