Perhaps you should try some spelling variations:
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
su triet » su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
sach thu » sach thue, sach thieu, sach tham
vu sach » vu bach, su sach, vu khach
va danh » va dinh, va dan, va hanh
van cam » van nam, van lam, van cau
su viet » so viet
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thu nang x ho. hieu van cam tu ((va thanh) or (va danh)) ki ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu nang x ho. hieu van cam tu ((va thanh) OR (va danh)) ki ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach thu nang x ho. hieu van cam tu ((va thanh) or (va danh)) ki ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: vu sach thu nang x ho. hieu van cam tu ((va thanh) or (va danh)) ki ((su triet) OR (su viet))*.